Useful unix codes

Context

Found myself frequently looking up codes for popular writing signs as I could only remember the classic — (—) and – (–)

Goal

To have as local reference + eventually remember them by making sense of their naming. Like the use of & and ; at the beginning/end of each code.

Arrows

up arrow (↑) — ↑
down arrow (↓) — ↓
left arrow (←) — ←
right arrow (→) — →
double headed arrow (↔) — ↔