Composed of letters and numbers
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'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.
A from z
It is 80903, exactly as in the question.
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
It means that in some place of the application any type of symbol is accepted - letters, numbers, spaces, special symbols.