THE FULL ARTICLE — from the International Standard Bible Encyclopedia

The International Standard Bible Encyclopedia (1915), general editor James Orr — public domain, printed whole.

tsa-tha' ("ts"): The eighteenth letter of the Hebrew alphabet, and as such employed in Ps 119 to designate the 18th part, every verse of which begins with this letter. It is transliterated in this Encyclopedia as "ts". It came also to be used for the number 90. For name, etc., see ALPHABET; TSADHE.