437 art n. ASCII art that also uses the block characters of IBM codepage 437. Used often in README files of DOS apps.
ANSI art n. colorized 437 art. Note that the term ANSI is a misnomer, as the only thing ANSI about it is the escape character sequences used in one of the encodings (the one that's actually sent over the wire). ANSI art would be a bit more ANSI if it used ISO-8859-1 aka Latin-1 character encoding instead of codepage 437.