Passwords are commonly alphanumeric. For example, 23$mathdoc2$!@9 is an alpha numeric password.
That one is the PIN number for my Swiss bank account.
10$standardman@!10
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A from z
Composed of letters and numbers
'Alpha' refers to letters. You may recognize it from 'Alphabet'. Numeric refers to numbers. Alpha + Numeric = Alphanumeric, or a list of figures that include both letters and numbers.
It is 80903, exactly as in the question.
To write 3 alpha characters and 1 numeric character, you can choose any three letters from the alphabet (A-Z) and combine them with a single numeric digit (0-9). For example, you could write "ABC1" or "XYZ7".