ѣ

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun The thirty-second letter of the Early Cyrillic alphabet. Its name is yat (Old Church Slavonic ѣть, Russian ять, Bulgarian ят, Serbian and Macedonian јат) and it represents the Common Slavonic long vowel æ: (IPA: /æː/), sometimes transliterated as ě. It is preceded by Ь and followed by Ю.