Romanization of Bulgarian
Ъ, Ь, ЗХ, ЙА, ЙУ, СХ, ТС, ТШ, ТЩ, ШТ, ШЦ transliterated as `A, `Y, Z|H, Y|A, Y|U, S|H, T|S, T|SH, T|SHT, SH|T, SH|TS respectively. In order to ensure full invertibility of the system, including the case of the ИЯ-exception rule, one may transliterate word-final -ИА as I|A rather than IA. The plain streamlined transliteration word form could be retrieved from its invertible variant by simply removing the additional symbols ` and |.