Codepage 437: IBM’s most widely used character codes
Codepage 437 of the IBM PC assigns various special symbols, extended Latin characters, and box drawing characters to the 33 control character points of ASCII (0x00 to 0x1F and 0x7F) and the 128 points of extended ASCII (0x80 to 0xFF), so that they can be used for semi-graphic purposes in text mode. In particular, box-drawing … “Codepage 437: IBM’s most widely used character codes” [More]