Useful unicode

Math symbols

Symbol Use
∘ Function composition
≡ Congurence
⋀ N-ary logic AND
⋁ N-ary logic OR
∑ N-ary summation
⨊ N-ary modulo 2 sum
∏ N-ary product
∐ N-ary coproduct
ℇ Euler constant
≈ Almost equal to
⩰ Approximately equal or equal to
⌈ ⌉ Ceiling
⌊ ⌋ Floor
∫ Integral
∬ Double integral
∭ Triple integral
⨌ Quadruple integral
⨯ Cross product of vectors
∂ Partial differential
′ Prime
″ Double prime
‴ Triple prime
± Plus-minus
∓ Minus-plus
⟂ Perpendicular
‖ Parallel
∝ Proportional to
¬ Not
⊨ True (not 'models')
⊭ not true
∀ forall
∃ exists
∄ doesn't exist
∴ therefore
∵ because
⊦ proves
⊬ doesn't prove
⊧ Models
≝ Equality by definition
⊄ Not proper subset
⊆ Subset or equal to
⊊ Not subset or equal to
∉ Not an element of
⟦ Semantics ⟦
⟧ Semantics ⟧
↪ Eval
↠ Transitive closure of redn
⊑ 
≈  ≉    
≋
≅  ≇
≡  ≢
=  ≠

≔ ≜ ≝

≤  ≰
≥  ≱
≺  ⊀
≻  ⊁ 
≼  ⋠
≽  ⋡

⊂  ⊄
⊃  ⊅
⊆  ⊈
⊇  ⊉

⊏  ⋢
⊐  ⋣
⊑  ⋢
⊒  ⋣

⊔
⊓ 


⊎ ⨄ 

⊢ ⊬
⊨ ⊭







 ⊭ ⊨ ⊧
   ⊩ 
 ⊬ ⊦
 ∄ ∃

↔ ↮
⇔

⊕ ⊙
⊃ ∥
⇒ →

Logic binary operators

—

⊹ ✠ ⧾
▽ ▶
⋆ ∘ ⋅

Boolean operations

Symbol Use
⊕ XOR

General

Symbol Use
¢ Cents (Ct)

Brackets

⎧ ⎫    
⎮ ⎮    
⎨ ⎬    
⎮ ⎮    
⎩ ⎭    


⎡ ⎤    ⎛  ⎞
⎢ ⎥    ⎜  ⎟
⎣ ⎦    ⎝  ⎠

Block characters

▀ top only
▌ left only
█ full block
▐ right only
▄ bottom only

Box-drawing

|       |       | Vert light | Vert heavy |
| Light | Heavy | hori heavy | hori light |
|-------+-------+------------+------------|
| ┌─┬─┐ | ┏━┳━┓ | ┍━┯━┑      | ┎─┰─┒      |
| │ │ │ | ┃ ┃ ┃ | │ │ │      | ┃ ┃ ┃      |
| ├─┼─┤ | ┣━╋━┫ | ┝━┿━┥      | ┠─╂─┨      |
| │╱│╲│ | ┃ ┃ ┃ | │ │ │      | ┃ ┃ ┃      |
| └─┴─┘ | ┗━┻━┛ | ┕━┷━┙      | ┖─┸─┚      |
|-------+-------+------------+------------|
| aa    | AA    | aA         | Aa         |

|       | Vert light | Vert heavy |
| Heavy | hori heavy | hori light |
|-------+------------+------------|
| ╔═╦═╗ | ╒═╤═╕      | ╓─╥─╖      |
| ║ ║ ║ | │ │ │      | ║ ║ ║      |
| ╠═╬═╣ | ╞═╪═╡      | ╟─╫─╢      |
| ║ ║ ║ | │ │ │      | ║ ║ ║      |
| ╚═╩═╝ | ╘═╧═╛      | ╙─╨─╜      |

Arrows

   →           ⇒        
 ↗   ↘       ⇗   ⇘       
↑     ↓     ⇑     ⇓       
 ↖   ↙       ⇖   ⇙       
   ←           ⇐               

   🡒         🡢           🡪    
 🡕   🡖      🡥  🡦       🡭  🡮     
🡑     🡓    🡡   🡣      🡩   🡫     
 🡔   🡗      🡤  🡧       🡬  🡯     
   🡐         🡠          🡨     

    ⇀
    ⇁
↿↾     ⇃⇂
    ↼
    ↽     

  ⮪         ⮫  
⮬   ⮯      ⮮  ⮭   
  ⮨         ⮩                                     

⮳⮷    ⮶⮲
⮴⮰    ⮱⮵

↱↰    ⮦⮧  ⮣⮢   ⮎⮌  ⮏
↳↲    ⮤⮥  ⮡⮠        ⮍

 ↦      ⇉       ⇢      ⇨
↥ ↧    ⇊ ⇈     ⇡ ⇣    ⇧ ⇩   
 ↤      ⇇       ⇠      ⇦      

  ⮉      ⮙       ⮝       ⯅    
⮈  ⮊  ⮘   ⮚   ⮜  ⮞   ⯇  ⯈    
  ⮋      ⮛       ⮟       ⯆    

  △        ▵   
◁   ▷     ◃ ▹  
  ▽        ▿   

◢ ◣    ◿ ◺
◥ ◤    ◹ ◸

◭ ⧨
◮ ⧩

↜ ↝ ↭

⇄ ⇅ ⇆

 ⤨         
⤧ ⤩         
 ⤪         

--- 

⤮ ⤭      ⤫ ⤬
⤲ ⤱      ⤰ ⤯

Combining

https://en.wikipedia.org/wiki/Combining_character

Other

Summation:

⎲
⎳

Made-up stuff

Product:

 k
┬─┬
│ │ aᵢCbᵢ
i=0

Square root (multi-line):


   ------------
  /
 /
√

Diode: ─▶⊢─

┌───────▶├─────┐         ┌──────┤├──────┐
│              │         │              │
│              ┴         ┴              ┴
▼              ▲         ┬              ┬
┬              │         │              │
│              │         └──────┤├──────┘
└──────┤◀──────┘

—

Also found ascii-art circuits at: https://www.qsl.net/yo5ofh/hobby%20circuits/ascii.htm

Letters and numbers

    Normal: ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
  mathsfbf: 𝗔𝗕𝗖𝗗𝗘𝗙𝗚𝗛𝗜𝗝𝗞𝗟𝗠𝗡𝗢𝗣𝗤𝗥𝗦𝗧𝗨𝗩𝗪𝗫𝗬𝗭𝗮𝗯𝗰𝗱𝗲𝗳𝗴𝗵𝗶𝗷𝗸𝗹𝗺𝗻𝗼𝗽𝗾𝗿𝘀𝘁𝘂𝘃𝘄𝘅𝘆𝘇
    mathbf: 𝐀𝐁𝐂𝐃𝐄𝐅𝐆𝐇𝐈𝐉𝐊𝐋𝐌𝐍𝐎𝐏𝐐𝐑𝐒𝐓𝐔𝐕𝐖𝐗𝐘𝐙𝐚𝐛𝐜𝐝𝐞𝐟𝐠𝐡𝐢𝐣𝐤𝐥𝐦𝐧𝐨𝐩𝐪𝐫𝐬𝐭𝐮𝐯𝐰𝐱𝐲𝐳
    mathsf: 𝖠𝖡𝖢𝖣𝖤𝖥𝖦𝖧𝖨𝖩𝖪𝖫𝖬𝖭𝖮𝖯𝖰𝖱𝖲𝖳𝖴𝖵𝖶𝖷𝖸𝖹𝖺𝖻𝖼𝖽𝖾𝖿𝗀𝗁𝗂𝗃𝗄𝗅𝗆𝗇𝗈𝗉𝗊𝗋𝗌𝗍𝗎𝗏𝗐𝗑𝗒𝗓
    mathbb: 𝔸𝔹𝔻𝔼𝔽𝔾𝕀𝕁𝕂𝕃𝕄𝕆𝕊𝕋𝕌𝕍𝕎𝕏𝕐𝕒𝕓𝕔𝕕𝕖𝕗𝕘𝕙𝕚𝕛𝕜𝕝𝕞𝕟𝕠𝕡𝕢𝕣𝕤𝕥𝕦𝕧𝕨𝕩𝕪𝕫
  mathfrak: 𝔄𝔅𝔇𝔈𝔉𝔊𝔍𝔎𝔏𝔐𝔑𝔒𝔓𝔔𝔖𝔗𝔘𝔙𝔚𝔛𝔜𝔞𝔟𝔠𝔡𝔢𝔣𝔤𝔥𝔦𝔧𝔨𝔩𝔪𝔫𝔬𝔭𝔮𝔯𝔰𝔱𝔲𝔳𝔴𝔵𝔶𝔷
   mbffrak: 𝕬𝕭𝕮𝕯𝕰𝕱𝕲𝕳𝕴𝕵𝕶𝕷𝕸𝕹𝕺𝕻𝕼𝕽𝕾𝕿𝖀𝖁𝖂𝖃𝖄𝖅𝖆𝖇𝖈𝖉𝖊𝖋𝖌𝖍𝖎𝖏𝖐𝖑𝖒𝖓𝖔𝖕𝖖𝖗𝖘𝖙𝖚𝖛𝖜𝖝𝖞𝖟
  mathsfit: 𝘈𝘉𝘊𝘋𝘌𝘍𝘎𝘏𝘐𝘑𝘒𝘓𝘔𝘕𝘖𝘗𝘘𝘙𝘚𝘛𝘜𝘝𝘞𝘟𝘠𝘡𝘢𝘣𝘤𝘥𝘦𝘧𝘨𝘩𝘪𝘫𝘬𝘭𝘮𝘯𝘰𝘱𝘲𝘳𝘴𝘵𝘶𝘷𝘸𝘹𝘺𝘻
mathsfbfit: 𝘼𝘽𝘾𝘿𝙀𝙁𝙂𝙃𝙄𝙅𝙆𝙇𝙈𝙉𝙊𝙋𝙌𝙍𝙎𝙏𝙐𝙑𝙒𝙓𝙔𝙕𝙖𝙗𝙘𝙙𝙚𝙛𝙜𝙝𝙞𝙟𝙠𝙡𝙢𝙣𝙤𝙥𝙦𝙧𝙨𝙩𝙪𝙫𝙬𝙭𝙮𝙯
  mathbfit: 𝑨𝑩𝑪𝑫𝑬𝑭𝑮𝑯𝑰𝑱𝑲𝑳𝑴𝑵𝑶𝑷𝑸𝑹𝑺𝑻𝑼𝑽𝑾𝑿𝒀𝒁𝒂𝒃𝒄𝒅𝒆𝒇𝒈𝒉𝒊𝒋𝒌𝒍𝒎𝒏𝒐𝒑𝒒𝒓𝒔𝒕𝒖𝒗𝒘𝒙𝒚𝒛
   mathcal: 𝒜𝒞𝒟𝒢𝒥𝒦𝒩𝒪𝒫𝒬𝒮𝒯𝒰𝒱𝒲𝒳𝒴𝒵𝒶𝒷𝒸𝒹𝒻𝒽𝒾𝒿𝓀𝓁𝓂𝓃𝓅𝓆𝓇𝓈𝓉𝓊𝓋𝓌𝓍𝓎𝓏
    mbfscr: 𝓐𝓑𝓒𝓓𝓔𝓕𝓖𝓗𝓘𝓙𝓚𝓛𝓜𝓝𝓞𝓟𝓠𝓡𝓢𝓣𝓤𝓥𝓦𝓧𝓨𝓩𝓪𝓫𝓬𝓭𝓮𝓯𝓰𝓱𝓲𝓳𝓴𝓵𝓶𝓷𝓸𝓹𝓺𝓻𝓼𝓽𝓾𝓿𝔀𝔁𝔂𝔃



     normal: 0123456789
     mathtt: 𝟶𝟷𝟸𝟹𝟺𝟻𝟼𝟽𝟾𝟿
     mathbf: 𝟎𝟏𝟐𝟑𝟒𝟓𝟔𝟕𝟖𝟗  
     mathbb: 𝟘𝟙𝟚𝟛𝟜𝟝𝟞𝟟𝟠𝟡  
     mathsf: 𝟢𝟣𝟤𝟥𝟦𝟧𝟨𝟩𝟪𝟫  
   mathsfbf: 𝟬𝟭𝟮𝟯𝟰𝟱𝟲𝟳𝟴𝟵  
superscript: ⁰¹²³⁴⁵⁶⁷⁸⁹
  subscript: ₀₁₂₃₄₅₆₇₈₉

Interesting stuff

Equality

Emojis

🙂 Slight smile
😂 tears of joy
🥴 woozy face
😄 Smile open mouth closed eyes
😃 Smile open mouth open eyes
🥱 Yawn
😅 Sweat smile
😁 'Toothy smile'
😬 Grimace
👋 Wave
👌 Chef kiss
👍 Thumbs up
👏 Clap

Reference: https://emojipedia.org/people/

Unwanted characters

Unwanted in normal text files.

References

More: