Learn to recognize the upper and lowercase letter s, how to write the letter ss and the sound that letter s makes.This series incorporates the modalities of visual, auditory andS, or s, is the nineteenth letter of the latin alphabet, used in the english alphabet, the alphabets of other western european languages and other latin alphabets worldwide.S, nineteenth letter of the modern latin alphabet.It corresponds to the semitic sin “tooth. †the greek treatment of the sibilants that occur in the semitic alphabet is somewhat complicated.The semitic …S, s noun (size) [ s or u ] abbreviation for small: