The characters, symbols, or systems that combine both letters and numbers; alphanumeric characters as a group.
Alphanumeric + -s (noun plural). Used as a count noun to refer to the collection of letters and numbers available in a writing or computer system.
In cybersecurity, experts talk about expanding 'alphanumerics' to include special symbols (!, @, #) because each additional character type multiplies the possible combinations, making passwords exponentially harder to crack through brute force.
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