Useful Unicode characters

Here are some useful Unicode characters I can't easily type with a keyboard, for copying and pasting purposes:

Arithmetic operations

× ÷

Arrows

↑ ↓ ← →

Fractions

½ ⅓ ⅔ ¼ ¾ ⅛ ⅜ ⅝ ⅞

Music

♯ ♭

Ticks

☐ ☑ ☒

Standards: ISBN | SI unit | Useful Unicode characters