Alphanumeric characters comprise the combination of the twenty-six characters of the alphabet (from A to Z) and the numbers 0 to 9. Therefore, 1, 2, q, f, m, p and 10 are all examples of alphanumeric characters. Symbols like *, & and @ are also considered alphanumeric characters.
These characters can also be used in combination. Examples of alphanumeric characters made of the combination of special symbols, numbers and the characters of the alphabet are &AF54hh, jjHF47, @qw99O. The characters of the alphabet can either be in lower case or upper case. The context of use determines whether or not case sensitivity is applied.