Alphanumeric characters are a combination of alphabetical and numeric characters. There are various synonyms for alphanumeric characters, varying from technical terms to colloquial expressions. One practical term is alphanumerics, a hybrid of letters and numerals. Another synonymous term is alphanumeric codes, which can be defined as a set of unique characters used to identify data in a coded format. Other informal words that can be used instead of alphanumeric characters are word-numbers, letter-digits, number-letters, and alphabetic numerals. Moreover, other technical expressions such as ASCII characters, character strings, and keyboard characters are also commonly used interchangeably with alphanumeric characters.