Shcha
Shcha or Shta (Щ, щ) is a letter of the Cyrillic alphabet, representing the consonant /ɕː/ or /ɕʨ/ in Russian, /ʃʧ/ or /ɕʨ/ in Ukrainian, and the consonant cluster /ʃt/ in Bulgarian. Originally, this letter was a ligature of sha and te (Ш + Т = Щ), with the descender in the middle of the sha, and is descended from the Glagolitic letter Shta: .
This letter is the most troublesome for romanization. In linguistics, its Russian pronunciation is transliterated as šč (with háčeks). In English, it is typically transcribed shch, but in German it requires seven letters: schtsch. This gave rise to a popular joke about Catherine the Great, a Russian tsarina of German origin, that she managed to make eight spelling mistakes in the two-letter word Щи (Shchi, a traditional Russian soup) because the word written according to German spelling rules is rendered "schtschi".The Latin Russian Wikipedia Romanized the Letter as Ş.