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DEC line drawing character set
The DEC Special Graphics character set (activated via
ESC ( 0) maps ASCII characters to box-drawing glyphs. Key mappings: j=\u2518 (bottom-right corner), k=\u2510 (top-right corner), l=\u250C (top-left corner), m=\u2514 (bottom-left corner), q=\u2500 (horizontal line), x=\u2502 (vertical line). These six characters form the basis for drawing boxes and borders in non-Unicode environments. Legacy applications like dialog, mc, and ncurses-based programs rely on this mapping.How this is tested: Send
\x1b(0jklmqx\x1b(B, verify all six characters rendered as box-drawing glyphs (none are the literal ASCII characters j, k, l, m, q, x).Analysis2026-03-26
Supported by all 5 tested terminals — universal adoption. Part of the Core TUI baseline.
Supported by 11 of 11 backends (100%)
Terminal Applications
| Terminal | Version | Support | Notes |
|---|---|---|---|
| iTerm2 | 3.6.9 | ✓ yes | |
| Ghostty | 1.3.1 | ✓ yes | |
| VS Code | 1.112.0 | ✓ yes | |
| Warp | 0.2026.03.18.08.24.03 | ✓ yes | |
| Cursor | 2.6.21 | ✓ yes | |
| Kitty | 0.46.2 | ✓ yes | |
| Terminal.app | 2.15 | ✓ yes |