Universal Multiple-Octet Coded Character Set

Box-drawing characters, solid and shaded blocks, and similar graphic characters were encoded in the UCS since 1991 (Unicode 1.0) for compatibility with character sets in various computer systems, especially IBM PC. The set of block characters was augmented in 1999 (Unicode 3.0) and in 2002 (Unicode 3.2) to cover additional platforms, due largely to proposals by Frank da Cruz [1] [2] [3] [4]. In 2019, Ewell et al. introduced Graphics for Legacy Computing block to support the similar characters included in various vintage computers and terminal emulators, including Apple, Atari and Commodore systems [5].