alphanumeric
adjectiveUK /ˌæl.fə.njuːˈmer.ɪk/
US /ˌæl.fə.nuːˈmer.ɪk/
Alphanumeric means using both letters and numbers together.
Your password must be alphanumeric, so use letters and numbers like 'abc123'.
OTHER MEANINGS
2. A character that is either a letter or a number.
The form only accepts alphanumerics in the username field.
3. A keyboard or display that can show both letters and numbers.
The old phone had an alphanumeric keypad.
4. A code made of letters and numbers used to identify something.
Each ticket has an alphanumeric code printed at the top.