This is a page that contains unique characters.

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Frequently used

μm (micrometer)
°C/℃
°F/℉

Math

Σ (sigma)
Δ (delta)
π (pi)
√ (square root)
∛ (cube root)
∜ (quad root or whatever this is)
𝔁/𝓍/𝙭/𝘹 (variable)
𝔂/𝓎/𝙮/𝘺 (variable)
𝔃/𝓏/𝙯/𝘻 (variable)
⅟/½/⅓/⅕/⅙/⅛/⅔/⅖/⅚/⅜/¾/⅗/⅝/⅞/⅘/¼ (fractions)

Radioactive

☢ (symbol)
⍺ (alpha)
β (beta)
γ (gamma)

Graphics

░▒▓█ (blocks with pseudo-brightness)
▂▃▄▅▆▇▉▊▋█▌▐▍▎▏▕▔▬〓▔▬(blocks with various thickness)
▀▄▌▐ (also blocks)
┃━╳╲╱┕┓┎┛┝┥┭┻╀ (lines)
║═╔╗╚╝╠╣╦╩╬ (pipes)
╭╮╯╰ /︵︶ (curves)

Others

☣ (infectious)
☻☺☹ (faces)
☎☏ (phones)
⌨ (keyboard)
✌☝☞☛☟☜☚✍ (hands)
♩♪♫♬♭♮♯°ø؂≠≭ (musical notes)
☀☁☂☃ (weather)
❆ (snowflake)