The letter Ш, ш.
"The historical text refers to the ruler as sha, an alternative spelling for shah."
Alternative form of shah (“king of Persia etc.”)
In plain English: Sha is an old-fashioned spelling of shaw, which means to move quickly and lightly on your feet.
"The old man's shaggy white hair was his most distinctive sha."
Abbreviation of Shawinigan.
"The company's headquarters in Sha employs over five thousand workers."
The word sha was borrowed directly from the Russian language as a loanword. It entered English without undergoing any significant change in its original meaning or pronunciation.