Useful symbols

symbology

ligature: ff fi fl ffi ffl

hyphen: ‐
non-breaking hyphen: ‑
minus sign: −
figure dash: ‒
en dash: –
em dash: —
horizontal bar: ―

non-breaking space: " "
en space: " "
em space: " "
1/3 em space: " "
1/4 em space: " "
1/6 em space: " "
figure space: " "
punctuation space: " "
thin space: " "
hair space: " "
zero width space: "​"

apostrophe: '
primes: ′ ″ ‴ ⁗
quote: ‘ ’  “ ”
ellipsis: …
arrows: ← ↑ → ↓
signs: ¡ ¿ ⁈ ⁉ 
interrobang: ‽
irony mark: ⸮
asterism: ⁂

bullet: • ◦ ● ○ ■ □ ▪ ▫
copyright: ™ ℠ © ® ℗
currency: ¤ ₳ ฿ ₵ ¢ ₡ ₢ $ ₫ ₯ ₠ € ƒ ₣ ₲ ₴ ₭ ₺ ℳ ₥ ₦  ₧ ₱ ₰ £  ៛ ₽ ₹ ₨ ₪ ৳ ₸ ₮ ₩ ¥

degrees: ° ℃ ℉
exponents: ⁰ ¹ ² ³ ⁴ ⁵ ⁶ ⁷ ⁸ ⁹ ⁿ
fractions: ¼ ½ ¾ ⅓ ⅔ ⅕ ⅖ ⅗ ⅘ ⅙ ⅚ ⅛ ⅜ ⅝ ⅞ ⅟ 

equality: ≈ ≠ ≤ ≥ ≪ ≫ ≺ 
operators: ÷ × · ∘ ∆ ∇  ∕  ± ∓ √ ∛ ∜  ∑ ∏ ∐ 
integral: ∫ ∬ ∭ ⨌ ∮ ∯ ∰ ∲ ∳
partial diff: ∂
tensor product: ⊗
cross product: ⨯
not: ¬
floor: ⌊ ⌋
ceil: ⌈ ⌉

for all: ∀
exists: ∃ ∄
therefore: ∴
because: ∵
ratio: ∶
proportion: ∷ ∝
maths: ⇒ ⇔ ≜ ≝ ≅ ≡ ⟨ ⟩ 
qed: ■ □
sets: ∅ ∈ ∉ ∋ ∌ ⊆ ⊂ ⊇ ⊃ ∪ ∩ ↦ 
sets: ℕ ℤ ℙ ℚ ℝ ℂ ℍ 
inf: ∞
dirac delta: δ
norm: |
divides: ∣ ∤
parallel: ∥ ∦
cardinality: ℵ ℶ 𝔠 
micro: µ
Ohm: Ω
Angstrom: Å
diameter: ⌀
benzene: ⌬ ⏣

card suits: ♠ ♣ ♥ ♦
musical: ♯ ♭ ♮ ♪ ♫
nonsense: ✞ ✡ ☪
hazard: ☢ ☣ ☠ ⚠ ⚡
crap: ☘ ☤ ☥ ☭ ☮ ☯ ⚒ ⚓ ⚔ ⚕ ⚖ ⚛ ♲ ♿
weather: ☀ ☁ ☂ ☔ ☃ ☄
misc: ★ ☆ ☺☻ ⌨
dingbats: ✂ ✈ ✌ ✏ ✓ ✗ ❋ ❦

box drawing:
─ │ ┌ ┐ └ ┘ ├ ┤ ┬ ┴ ┼
═ ║ ╒ ╓ ╔ ╕ ╖ ╗ ╘ ╙ ╚ ╛ ╜ ╝ ╞ ╟ ╠ ╡ ╢ ╣ ╤ ╥ ╦ ╧ ╨ ╩ ╪ ╫ ╬
▀ ▄ █ ▌ ▐ ░ ▒ ▓

emoticons:
😀 😁 😂 😃 😄 😅 😆 😇 
😈 😉 😊 😋 😌 😍 😎 😏 😐 😑 😒 😓 😔 😕 😖 😗
😘 😙 😚 😛 😜 😝 😞 😟 😠 😡 😢 😣 😤 😥 😦 😧
😨 😩 😪 😫 😬 😭 😮 😯 😰 😱 😲 😳 😴 😵 😶 😷
😸 😹 😺 😻 😼 😽 😾 😿 🙀
🙅 🙆 🙇 🙈 🙉 🙊 🙋 🙌 🙍 🙎 🙏

table flip:
(╯°□°）╯︵ ┻━┻
(┛◉Д◉)┛┻━┻
(ノಠ益ಠ)ノ彡┻━┻

annoyed:
ಠ‿ಠ
ಠ⌣ಠ
ಠ╭╮ಠ
ಠ︵ಠ凸
ಠ益ಠ
ಠ益ಠ

confused:
¯\(º o)/¯
¯\_(⊙︿⊙)_/¯
¯\_(ツ)_/¯

misc: 
àáâãäåæāăąǎǡǻǽȁȃɐạảấầẩẫậắằẳẵặ
ç
èéêëēĕėęěȅȇȩɘəӗҽҿẹẻẽếềểễệ
ì í î ï ĩ ī ĭ į ı ij ȉ ȋ ỉ ị
ñ
òóôõöøōŏőœǫǭȍȏȫȭȯȱọỏốồổỗộớờởỡợὀὁὂὃὄὅ
ùúûüũūŭůűųǔǖǘǚǜụủứừửữự