alphabetset

2. A collection of symbols or characters used in a writing system.

The ancient alphabetset included symbols for numbers as well as sounds.

3. A complete group of letter tiles or blocks used for games and learning.

We lost the letter E from our alphabetset, so we couldn't spell 'tree'.

4. In computing, a defined set of characters that a system can display or process.

The program supports a basic alphabetset of uppercase and lowercase letters.