Extended ASCII
Extended ASCII means an eight-bit character encoding that includes (most of) the seven-bit ASCII characters, plus additional characters. Using the term "extended ASCII" is sometimes criticized,[1][2][3] because it can be mistakenly interpreted to mean that the ASCII standard has been updated to include more characters, or that the term unambiguously identifies a single encoding, neither of which is the case.

There are many extended ASCII encodings (more than 220 DOS and Windows codepages). EBCDIC ("the other" major 8-bit character code) likewise developed many extended variants (more than 186 EBCDIC codepages) over the decades.
Some people call any non-ASCII character in Unicode "extended ASCII". In other contexts only the UTF-8 encoding counts, and in yet other contexts no Unicode encoding is considered extended ASCII.