More like this
SHIN shĭn (שׁ). The twenty-first letter of the Heb. alphabet. It is found at the head of the twenty-first section of
International Standard Bible Encyclopedia (1915)
shen, sen "sh", "s": The 21st letter of the Hebrew alphabet; transliterated in this Encyclopedia as "sh" and "s". It came also to be used for the number 300. For name, etc., see Alphabet.