Analysis of information sources in references of the Wikipedia article "Common Turkic alphabet" in English language version.
э(ə)СРи :леорард ( Китаб аль – Идрак ли – Лисан аль – Атрак ), тигр (Махмуд Кашгари)
In the earlier Azerbaijani Cyrillic there were variations: ə (= э).