▁the ▁writing ▁systems ▁of ▁other ▁languages , ▁ ▁commonly ▁represents ▁, ▁ ▁or ▁. ▁In ▁French ▁orth ography , ▁ ▁is ▁used ▁to ▁represent ▁. ▁It ▁may ▁also ▁be ▁silent ▁at ▁the ▁end ▁of ▁words . ▁In ▁Spanish ▁orth ography , ▁ ▁is ▁used ▁to ▁represent ▁. ▁ ▁In ▁the ▁He p burn ▁roman ization ▁of ▁Japanese , ▁ ▁is ▁used ▁to ▁represent ▁. ▁This ▁sound ▁is ▁usually ▁considered ▁to ▁be ▁an ▁allo phone ▁of ▁, ▁which ▁is ▁pron ounced ▁in ▁different ▁ways ▁depending ▁upon ▁its ▁context ; ▁Japanese ▁ ▁is ▁pron ounced ▁as ▁ ▁before ▁. ▁In ▁Wel sh ▁orth ography , ▁ ▁represents ▁ ▁while ▁ ▁represents ▁. ▁In ▁S lav ic ▁languages , ▁ ▁is ▁used ▁primarily ▁in ▁words ▁of ▁foreign ▁( G reek , ▁Latin , ▁or ▁German ic ) ▁origin . ▁In ▁spoken ▁I cel and ic , ▁ ▁in ▁the ▁middle ▁of ▁a ▁word ▁is ▁often ▁pron ounced ▁as ▁a ▁v ▁( e . g . ▁A ð ▁so fa ▁- ▁to ▁sleep ). ▁ ▁International ▁Ph on etic ▁Al phabet ▁The ▁International ▁Ph on etic ▁Al phabet ▁uses ▁ ▁to ▁represent ▁the ▁vo ic eless ▁lab iod ental ▁fr ic ative . ▁ ▁In ▁mathematics ▁An ▁ital ic ▁letter ▁ ▁is ▁convention ally ▁used ▁to ▁denote ▁an ▁arbitrary ▁function . ▁See ▁also ▁f ▁with ▁hook ▁( ƒ ). ▁ ▁Other ▁uses ▁ ▁The ▁letter ▁F ▁has ▁become ▁an ▁Internet ▁m eme , ▁where ▁it ▁is ▁used ▁to ▁pay ▁respect s . ▁This ▁use ▁is ▁derived ▁from