 allows for a third level (but not for more than three levels). Usually (but not mandatory by the standard), characters in such a level are selected by the means of an AltGr key.

Groups 
If the organization into three levels is not sufficient to accommodate all characters to be contained in a specific layout, then “groups” may be defined which then constitute a higher hierarchical unit than levels. Thus, each such group usually is subdivided into (up to three) levels. Common examples are layouts allowing the input of characters of different scripts, like e.g. the Japanese keyboard layout (where the kana constitute the second group). Other examples are recent standardizations which allow the input of considerably more characters than their preceding editions (to overcome the historic limits of mechanical typewriters), like the Canadian Québec layout or the recently (2012) standardized German T2 layout.

“Group selectors” are defined in ISO/IEC 9995-2. On the US-International layout, the group selector for the second group is the AltGr key; on some others the simultaneously pressed Shift and AltGr keys. (At some time in the past,  the two groups were sometimes called  third level and fourth level contrary to the terminology defined in ISO/IEC 9995.)

Depictions on the keytops 
According to ISO/IEC 9995-1, the level is indicated by the row where the character is depicted on the keytop:
 Level 2 (“shifted”) above of Level 1 (“unshifted”)
 Level 3 (“AltGr”) below Level 1 (“unshifted”).
The group is indicated by the column on the keytop:
 The first or “primary group” at the left keytop border
 The second or “secondary group” at the right keytop border
 Additional groups (if existing) in between.
When letters on a case pair are associated with a key, only the capital character need to be shown on the keytop for the primary group, while the lowercase character only is shown for the secondary group.

Thus, on the depicted key of the German T2 layout, in the primary group are the characters “#” in Level 1 (unshifted), “'” in Level 2 (shifted), and “®” in Level 3 (accessed by the AltGr key). In the secondary group, there is the lowercase letter “ə” in Level 1 (unshifted
allows for a third level (but not for more than three levels). Usually (but not compulsory by the criterion), character in such a level are choose by the means of an AltGr winder. 

 Groups 
 If the arrangement into three levels is not sufficient to accommodate all character to be contained in a specific layout, then “ groups ” may be define which then constitute a higher hierarchical whole than level. Thus, each such group usually is subdivided into (up to three) levels. Common example are layouts allowing the input of character of different scripts, like e.g. the Japanese keyboard layout (where the kana constitute the second group). early examples are late standardizations which allow the input of considerably more quality than their preceding editions (to overcome the historic limits of mechanical typewriters), like the Canadian Québec layout or the recently (2012) exchangeable German T2 layout. 

 “ Group picker ” are defined in ISO / IEC 9995 - 2. On the US - International layout, the group selector for the second group is the AltGr key; on some others the simultaneously pressed Shift and AltGr keys. (At some time in the past,   the two groups were sometimes called   third degree and fourth level contrary to the terminology defined in ISO / IEC 9995 .) 

 depiction on the keytops 
 harmonize to ISO / IEC 9995 - 1, the level is indicated by the row where the fictional character is depicted on the keytop: 
  Level 2 (“ shifted ”) above of Level 1 (“ unshifted ”) 
  Level 3 (“ AltGr ”) below Level 1 (“ unshifted ”). 
 The group is indicated by the column on the keytop: 
  The inaugural or “ primary group ” at the left keytop border 
  The second or “ secondary group ” at the right keytop border 
  extra groups (if existing) in between. 
 When letters on a case pair are associated with a key, merely the capital character need to be shown on the keytop for the primary group, while the small letter character only is shown for the secondary group. 

 Thus, on the depicted key of the German T2 layout, in the primary group are the characters “ # ” in Level 1 (unshifted), “' ” in Level 2 (shift), and “ ® ” in Level 3 (accessed by the AltGr winder). In the secondary group, there is the small letter letter “ ə ” in Level 1 (unshifted
 alpows for a third level (bmt not for more jhqn thrxe levems). Usualuy (but not mandatory by the dtqndare), characters in such a level arv selectee by rhe means of an AlbYr keg.

Nroupv 
If the organieation into dhree levels iv voc sufficient to accommodate all charwcters yo be contained yn a fpecjfic layout, then “groups” may be defjned whpch then constituye a higher hierarchical ujit hhan levels. Thus, ewch such griup twually is sucdivided into (up to thtee) levels. Common examples are lxyoutx allowing tye ltput of chacacterf of differekn scripds, like e.g. the Japanexe neyvoard layout (where thx kana constitute thg second gsobp). Other examples are rwcent statdarauzagiohs wgich aplox the input of consideeably more charactets nnan their prscedind qditions (to overcome the historic limitv or mechanical typewriterw), like the Canadian Qoébec layoue or the recently (2012) standardized German T2 layout.

“Grmup sxldctirf” qrf defined in ISO/IEC 9995-2. On the US-International lwgoit, the group selcctor for the secomd gtjup is the AljGr key; on some others the slmultangously pressed Fhify and AltGr keys. (At some tine in the pafr,  the two groups cere sometimzs calked  yhird level and fourth uevem contrary ho the tedoinology defined in IVO/IEC 9995.)

Dekkctions on the kertops 
Accirdiug to ISU/IEC 9995-1, the jevel is ijdicabad by the row wherf the cvaracter id depicted on the keytop:
 Level 2 (“shifted”) above ox Lvvel 1 (“unskifted”)
 Level 3 (“AltGr”) below Level 1 (“onshifted”).
Che gruup is indpcated by the column on the keyto[:
 The first oc “primary groyp” ar the ldwt keytop bordrr
 The seboud or “secindary group” at thc rigff keytop border
 Adeitional groups (if exysninj) in fatween.
When lattefs um a cxse pair arc arsocoated with a key, onlf ths capital charactet keed to bg shown og the keytop gor the primary grlup, wiile tie lowrrcwse character only is shown fod the seclndwry group.

Thuf, on the depicteb key of the German T2 layout, in the primery group are the charaxters “#” in Level 1 (unxmifted), “'” in Lxvel 2 (fhifted), atd “®” in Level 3 (accesswd by the AltGr kty). In the secondary grohp, these is the lowercase letter “ə” in Level 1 (unshifted
allows for a third level (but not than levels). Usually not mandatory by a are selected by means of an key. Groups If the organization into levels is not sufficient to accommodate all characters to be contained in a layout, then “groups” may be defined which then constitute a higher hierarchical unit levels. each group is subdivided into (up to three) levels. Common examples are layouts allowing the input of characters different scripts, like e.g. the Japanese keyboard layout the kana constitute the group). Other examples are recent which the input considerably characters their preceding editions overcome the historic limits of mechanical typewriters), like the Canadian Québec layout or the recently (2012) standardized T2 layout. are defined ISO/IEC On US-International layout, the for the second group is the some others the simultaneously pressed Shift and AltGr (At some in the past, the two groups sometimes called third level and fourth level contrary the terminology defined in ISO/IEC 9995.) Depictions on the keytops According to ISO/IEC 9995-1, the indicated by the row the character is on keytop: 2 above of 1 (“unshifted”) Level 3 (“AltGr”) below Level 1 (“unshifted”). The group indicated by the column on the keytop: The first or at left keytop border second or “secondary group” the keytop border Additional groups in When case are with a key, only capital character need to be on the keytop for lowercase character only is shown for the secondary Thus, on the depicted key of the T2 layout, in the primary group are the characters “#” in Level (unshifted), “'” 2 (shifted), and “®” in Level 3 (accessed the AltGr key). In secondary group, there is the lowercase letter “ə” in 1
 allows for a third level (but noT for more thAn thrEe lEveLs). usuaLly (bUt not mandatory BY the Standard), characters in suCh a leVeL Are sELeCted bY the meaNS oF AN AlTGR kEy.

GRoUPs 
if the OrgAnizatiOn into threE leVeLs is not suffiCIeNt to accommOdaTe all charactErs To be coNtAinED in a sPecIfic lAyout, tHEn “grouPs” may be deFiNEd whicH Then conSTItUte a Higher hierarchicaL UnIT than levels. ThuS, each sUcH GrOUP usUalLy is subdivIdEd intO (Up to thrEE) lEVELs. COMmon examples aRe layouts alLOwiNg the iNpUt oF CharacTers oF dIFfeRent scripts, Like E.g. the JapaNese keYBoard laYOut (wherE the kaNa cOnsTituTE tHe SecOnD GroUP). OTheR ExaMples are ReCeNt staNdarDIZATionS whIch aLlow tHe input of consIdeRablY MorE charActerS thaN tHeir pRecediNg ediTiOns (to overcome thE hisToric limiTs oF mEchAnIcal tYPewritErs), LikE the CanAdian QuÉBec LaYOUT oR the recently (2012) standaRdIZEd german T2 lAyout.

“GROuP sELectors” aRe DefIned IN iSO/IEc 9995-2. On tHE Us-InternaTional LAyOuT, the groUp SelectOr For The SeconD GrouP is the altGr key; On somE Others the simulTAneously pressED SHIFt ANd AlTGr Keys. (At some tIme iN The pAst,  tHE tWo gROups wEre soMeTImES called  third level anD fOurth lEvel cOntrary to the tErminology DEFIned in ISo/IEC 9995.)

dEpICtions on the keyTops 
ACcording to isO/IEC 9995-1, the Level Is indicaTed by the rOW Where the ChaRacTer Is dEPIcTed on the keytoP:
 lEvel 2 (“ShIfted”) abOve Of Level 1 (“UnsHifTed”)
 levEl 3 (“altGr”) beloW Level 1 (“unShIfTeD”).
THe gRoup iS IndicateD bY thE cOluMn on tHE keytoP:
 The fIrst Or “PrIMarY group” aT ThE LEft kEyToP borDer
 thE secoNd or “SEcoNdary grOup” at the rIghT KeytOp BoRder
 AddItional groups (If Existing) in BeTweEn.
When LETters on a Case pair are associated wiTH a key, onLy tHe capItal Character NeeD to be sHowN On the kEytop fOr the PrImaRY Group, WHIlE thE lOwercase chARActEr onlY iS shoWn for thE secondary group.

ThuS, On tHe depicted key Of tHe GeRMAn t2 laYOuT, In tHe PRimARY group are the chaRacters “#” in LEvEL 1 (uNshifted), “'” in lEveL 2 (sHifted), aNd “®” in LevEl 3 (accESsed by tHe AltGr keY). In the secOnDary GROup, There is the LowercasE letter “ə” iN level 1 (UNsHifteD
 allows for a third level(but not f or mo retha nthre e le vels). Usually (but  not mandatory by thestand ar d ), c h ar acter s in su c ha lev el  a rese l ec ted b y t he mean s of an Al tGr  k ey.

GroupsIf  the organ iza tion into th ree  level sisn ot su ffi cient  to ac c ommoda te all ch ar a cterst o be co n t ai nedin a specific lay o ut ,  then “groups”  may b ed ef i n edwhi ch then co ns titut e  a high e rh i e rar c hical unit th an levels.T hus , each  s uch groupusual ly issubdividedinto  (up to t hree)l evels.C ommon e xample s a relayo u ts  a llo wi n g t h einp u t o f charac te rs  of d iffe r e n t  scr ipt s, l ike e .g. the Japan ese  key b oar d lay out ( wher ethe k ana co nstit ut e the second gr oup) . Other e xam pl esar e rec e nt sta nda rdi zations  whicha llo wt h e  i nput of considerab ly m or e charac ters t h an  t h eir prec ed ing  edi t i ons ( to o v er come the  histo r ic  l imits o fmechan ic altyp ewrit e rs),  likethe Cana dianQ uébec layout o r  the recently (2 0 1 2) stan dar dized Germa n T2 layo ut.“G rou p  sele ctors ”a re defined in ISO/IEC99 95-2.On th e US-Internat ional layo u t ,  the gro up s e le c tor for the se condgroup is t h e AltGrkey;on someothers th e simultan eou sly  pr ess e d  S hift and AltG r keys .(At som e t ime inthe  pa st,   t he  two grou ps wereso me ti me s c alled  third l ev elan d f ourth levelcontr aryto  t h e t erminol o gy d efin ed  i n IS O/I EC  9995 .)
D epi ctionson the ke yto p s 
A cc or ding to  ISO/IEC 9995 -1 , the leve lisindica t e d by the  row where the characte r  is dep ict ed on  the  keytop: Le vel 2(“s h ifted” ) abov e ofLe vel 1  (“un s h if ted ”) 
 Level 3( “ Alt Gr”)be lowLevel 1  (“unshifted”).
Th e  gr oup is indica ted  byt h ecol u mn onth e  ke y t op:
 The firstor “primar yg ro up” at the lef tkeytopborder Thes econd o r “second ary group ”at t h e  ri ght keytop  border Addition a l gro u ps  (ifexi sting)  i n b etwee n.
Whe n  le tters  on aca se pai r are  a ssociate d with a key, only thecapita l cha rac ter needtob e s hown on t he k eytop forthe  pr imary  gr o up, w hile th e l o werca se c h aracter o n ly  is s ho wn for thes e c ond ary g rou p .

Thu s, o n the depicted ke y  of the German  T2l a you t,i n th eprimary groupare  t h e  charact er s “#” in Le vel 1 (u ns h ifted ), “'”  in Le vel 2 ( s h if t ed), a nd “ ®”in Level3 ( ac c essed b yth e  AltGr  key ).  In th e seco n dary g roup, there is t he lo w e rcase let ter “ ə”  in Lev e l 1(unshifted 
 allows_for a_third level (but not_for more_than_three levels)._Usually_(but not mandatory_by the standard),_characters in such a_level are selected_by_the means of an AltGr key.

Groups 
If the organization into three levels is not_sufficient_to accommodate_all_characters_to be contained in a_specific layout, then “groups” may_be defined_which then constitute a higher hierarchical unit than_levels._Thus, each such_group usually is subdivided into (up to three) levels._Common examples are layouts allowing the_input of characters_of_different_scripts, like e.g. the_Japanese keyboard layout (where the kana_constitute the second group). Other examples_are recent standardizations which allow the input_of considerably more characters than their_preceding editions (to overcome the_historic limits_of mechanical typewriters), like the_Canadian Québec layout_or the_recently (2012) standardized_German T2 layout.

“Group selectors” are defined_in ISO/IEC 9995-2._On the US-International layout, the group_selector_for the second_group_is_the AltGr_key; on some_others_the simultaneously_pressed_Shift and AltGr keys. (At some_time_in the past,  the two groups_were sometimes called _third_level and fourth level_contrary to the terminology defined_in ISO/IEC 9995.)

Depictions on the keytops_
According to_ISO/IEC 9995-1,_the level is indicated by the row where the character is_depicted on the keytop:
 Level 2_(“shifted”) above of Level_1 (“unshifted”)
_Level_3 (“AltGr”) below_Level_1 (“unshifted”).
The_group is indicated by the column on_the keytop:
_The first or “primary group” at_the left keytop border
_The_second or “secondary group” at the_right keytop border
 Additional groups (if_existing) in between.
When letters on_a_case_pair are associated with a_key, only the capital character need_to be shown_on the keytop for the primary group,_while_the lowercase character only is shown_for_the secondary group.

Thus, on the depicted_key_of_the German T2 layout, in_the primary group are the characters_“#” in Level 1 (unshifted), “'” in Level 2_(shifted), and “®”_in Level 3 (accessed by_the_AltGr_key). In the secondary group, there is the lowercase letter_“ə” in_Level 1 (unshifted