▁hockey ▁r ink ▁feature ▁three ▁or ▁four ▁LED ▁displays ▁the ▁size ▁of ▁one ▁advert ising ▁ho arding ▁which ▁will ▁show ▁scoring ▁information ▁and ▁prom ot ional ▁messages , ▁though ▁their ▁limited ▁visibility ▁makes ▁them ▁rarely ▁used . ▁ ▁A ▁horn ▁or ▁bu z zer ▁must ▁be ▁used ▁to ▁signal ▁end ▁of ▁timeout s ▁or ▁period . ▁In ▁most ▁games , ▁the ▁home ▁team ▁will ▁either ▁play ▁a ▁recording ▁of ▁or ▁use ▁a ▁separate ▁goal ▁horn , ▁usually ▁an ▁Air ch ime , ▁K ahlen berg , ▁or ▁Bu ell ▁when ▁their ▁team ▁scores . ▁These ▁aren ' t ▁required , ▁but ▁are ▁rather ▁used ▁as ▁a ▁celebr ation , ▁and ▁they ▁are ▁often ▁unique ▁to ▁their ▁team ▁and ▁easily ▁ident ifiable . ▁A ▁notable ▁example ▁would ▁be ▁the ▁recording ▁that ▁the ▁Boston ▁Bru ins ▁play ▁which ▁is ▁used ▁by ▁many ▁other ▁teams . ▁ ▁Mot ors ports ▁In ▁auto ▁racing , ▁the ▁score board ▁typically ▁displays ▁the ▁running ▁order ▁of ▁the ▁race , ▁and ▁number ▁of ▁la ps ▁completed . ▁Some ▁more ▁complex ▁bo ards ▁scroll ▁statistics ▁such ▁as ▁average ▁speed , ▁la ps ▁behind , ▁and ▁timing ▁reports . ▁ ▁Rugby ▁football ▁All ▁codes ▁of ▁rugby ▁football ▁have ▁a ▁game ▁clock , ▁the ▁number ▁of ▁tries , ▁pen alt ies , ▁field ▁goals ▁and ▁convers ions ▁listed . ▁ ▁Track ▁and ▁field ▁In ▁track ▁and ▁field ▁there ▁is ▁usually ▁an ▁el apsed ▁time ▁display . ▁ ▁Sometimes ▁the ▁team ▁scores ▁are ▁displayed . ▁ ▁O ften ▁in ▁higher ▁levels ▁there ▁is ▁a