A Nonalphanumeric Character Is What?

Any character, or symbol, that displays on a keyboard but is neither a number or a letter is referred to as a nonalphanumeric character. This includes mathematical symbols and punctuation. In order to increase security, some password conventions demand that users choose at least one non-alphanumeric character for their passwords.

Punctuation marks, such as commas, periods, exclamation points, quote marks, colons, question marks, and semicolons, are also referred to as nonalphanumeric characters. The dollar sign, the ampersand, the asterisk, the plus sign, the equals sign, the underscore, the tilde, the percent sign, and the slash are additional non-alphanumeric characters that are frequently found on keyboards. A nonalphanumeric character is any character on a keyboard that isn’t one of the 26 letters of the alphabet or a numeric character (usually 1-0).

Misha Khatri
Misha Khatri is an emeritus professor in the University of Notre Dame's Department of Chemistry and Biochemistry. He graduated from Northern Illinois University with a BSc in Chemistry and Mathematics and a PhD in Physical Analytical Chemistry from the University of Utah.

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