What Does ANSI Character Set Mean?

The ANSI character set is a set of standardized characters developed by the American National Standards Institute (ANSI), a volunteer organization dating back to the early 1900s. ANSI character sets have been evolved to create consistent standards across the computing industry.

Techopedia Explains ANSI Character Set

The ANSI character set was the standard set of characters used in Windows operating systems through Windows 95 and Windows NT, after which Unicode was adopted. ANSI consists of 218 characters, many of which share the same numerical codes as in the ASCII/Unicode formats.