ꟙ

Alternative forms
$⟨Ꟙ⟩$ may vary in appearance from a Greek σ to a digit 6.

Letter

 * 1) "Sigmoid s". A medieval form of the letter s, used in Middle English, Middle Scots and Middle Cornish.

Usage notes
Usage varies. In some manuscripts, sigmoid $⟨ꟙ⟩$ appears in word-final position and long $⟨ſ⟩$ elsewhere; in others, sigmoid $⟨ꟙ⟩$ appears in word-initial position, long $⟨ſ⟩$ medially and $⟨s⟩$ word-finally. Or scribes may vary the forms apparently randomly.