▁Pers ian ▁of ▁Afghan istan , ▁has ▁been ▁officially ▁named ▁D ari ▁( , ▁) ▁since ▁ 1 9 5 8 . ▁Also ▁referred ▁to ▁as ▁Afghan ▁Pers ian ▁in ▁English , ▁it ▁is ▁one ▁of ▁Afghan istan ' s ▁two ▁official ▁languages ▁together ▁with ▁Pas ht o . ▁The ▁term ▁D ari , ▁meaning ▁" of ▁the ▁court ", ▁originally ▁referred ▁to ▁the ▁variety ▁of ▁Pers ian ▁used ▁in ▁the ▁court ▁of ▁the ▁S as an ian ▁Empire ▁in ▁capital ▁C tes i phon , ▁which ▁was ▁spread ▁to ▁the ▁n ortheast ▁of ▁the ▁emp ire ▁and ▁gradually ▁replaced ▁the ▁former ▁Iran ian ▁dialect s ▁of ▁Par th ia ▁( Par th ian ). ▁ ▁T aj ik ▁Pers ian ▁( , ▁), ▁that ▁is ▁the ▁standard ▁Pers ian ▁of ▁T aj ik istan , ▁has ▁been ▁officially ▁designated ▁as ▁T aj ik ▁( , ▁) ▁since ▁the ▁time ▁of ▁the ▁Soviet ▁Union . ▁It ▁is ▁the ▁name ▁given ▁to ▁the ▁vari eties ▁of ▁Pers ian ▁spoken ▁in ▁Central ▁Asia , ▁in ▁general . ▁ ▁ISO ▁codes ▁ ▁The ▁international ▁language - encoding ▁standard ▁ISO ▁ 6 3 9 - 1 ▁uses ▁the ▁code ▁fa , ▁as ▁its ▁coding ▁system ▁is ▁mostly ▁based ▁on ▁the ▁native - language ▁design ations . ▁The ▁more ▁detailed ▁standard ▁ISO ▁ 6 3 9 - 3 ▁uses ▁the ▁name ▁" Pers ian " ▁( code ▁fas ) ▁for ▁the ▁dialect ▁continu um ▁spoken ▁across ▁Iran ▁and ▁Afghan istan . ▁This ▁consists ▁of ▁the ▁individual ▁languages ▁D