[_kst_]

And "ANSI" is also a misnomer.

It's typically used to refer to certain Microsoft 8-bit code pages, like Windows-1252, that extend 7-bit ASCII to 8 bits. My understanding is that these code pages were proposed as an ANSI standard, but never adopted. ISO 8859-1 (Latin-1) is similar but not identical to Windows-1252 (Latin-1 has control characters in some positions where Windows-1252 has printable characters -- and Unicode inherits those control characters from Latin-1.)