Shha with hook
Shha with hook (, ), also referred to as Heng, is a letter of the Cyrillic script formerly used in some alphabets in Kabardian and a 1908 alphabet for Chechen. Use 

Shha with hook was used in the Kabardian alphabet of  in 1865, the alphabet of Lev Lopatinsky in 1890, and the alphabet of  in 1906. Computing codes 
This letter has not yet been added to Unicode. See also 
 Ꜧ ꜧ - Heng
 Һ һ - Shha 
 Ԧ ԧ - Shha with descender
 Kabardian language
 Cyrillic script

Sources 

Cyrillic letters
Letters with hook
Unencoded Cyrillic letters