letter , ****
letter of the alphabet
alphabetic character

In fact, each had a single letter of the alphabet.

He has a name for every letter of the alphabet.

If this is too easy, try thinking up one for each letter of the alphabet.

Well, all the letters of the alphabet for a start.

In 1903, the company began using the first 19 letters of the alphabet to name new cars.

It is not considered an independent letter of the alphabet.

The leader takes a watch with a second hand, points to a player and calls out a letter of the alphabet.

Ability to identify at least some letters of the alphabet.

However, these are not considered separate letters of the alphabet.

A given note would represent a word or a letter of the alphabet.