tsa-tha' ("ts"):

The eighteenth letter of the Hebrew alphabet, and as such employed in Psalms 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.

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Bibliography Information
Orr, James, M.A., D.D. General Editor. "Entry for 'TSADHE'". "International Standard Bible Encyclopedia". 1915.