Caz it has more than those book emojis. It makes writing geometric code docstrings easier. Here's the rest of it (HN doesn't format it good, try copy/paste it).

   cjk→⋰⋱| | ← cjk space btw | |
   thinsp | |
   deg° 
   ⋯ …
   ‾⎻⎼⎽ lines
   _ light lines
   ⏤ wide lines
   ↕
   ∧∨ 
 ┌────┬────┐ 
 │    │ ⋱  ⎸ ← left bar, right bar: ⎹
 └────┴────┘
    ⊃⊂ ⊐≣⊏
    ⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯====›‥‥‥‥

◁ ◿ ◺ ◻ ◸ Λ ╱│╲ ╱ │ ╲ ──┼── ╲ │ ╱ ╲│╱ V ┌ ─┏━━┳━━━━━━━┓ │ ┃ ┃ ┃ ├ ─┣━━╋━━━━━━━┫ │ ┃ ┃ ┃ └ ─┗━━┻━━━━━━━┛ ┌ ─ ┬ ─ ┐ ├ ─ ┼ ─ ┤ └ ─ ┴ ─ ┘ ┌───┬───┐ ├───┼───┤ │ │ │ └───┴───┘ . ╱│╲ ↘╱ │ ╲ ↙ ╱ │ ╲ →‹───┼───›← ╲ │ ╱ ↗ ╲ │ ╱ ↖ ╲│╱ ↓↑ ╳ . ╱ ╲ ╱ ╲ ╱ ⋰ ╲ ╱⋰______╲