Yat
Yat (Ѣ ѣ) is a letter used in old Slavic languages. Yat was a common Slavic long vowel. There was also kind known as Iotated Yat (Ꙓ ꙓ).
Yat Media
Cyrillic letter yat, set in several fonts. Note that in italic, the lower-case (ѣ) resembles the iotated yat.
Pre-revolution typewriter with Yat on the bottom row, between Ч and С.
Cover of 1880 edition of Turgenev's Fathers and Sons, with yat in the title; in modern orthography, дѣти is spelled дети.
An extract from the third edition of Dal's Explanatory Dictionary showing yat with diaeresis in the words звѣ̈здка and звѣ̈здочка (third line); in the modern orthography these are spelled as звёздка and звёздочка.
Nationalist take on the border between Serbian and Bulgarian that classifies all ekavian Bulgarian dialects as Serbian. By Aleksandar Belić (1914)