Unicode characters I frequently cut-n-paste.

— EM DASH — General Punctuation DashPunctuation
§ SECTION SIGN § Latin-1 Supplement OtherSymbol
§

← LEFTWARDS ARROW ← Arrows MathSymbol
⇐ LEFTWARDS DOUBLE ARROW ⇐ Arrows OtherSymbol
→ RIGHTWARDS ARROW → Arrows MathSymbol
⇒ RIGHTWARDS DOUBLE ARROW ⇒ Arrows MathSymbol

† DAGGER † General Punctuation OtherPunctuation
‡ DOUBLE DAGGER ‡ General Punctuation OtherPunctuation

⚧ MALE WITH STROKE AND MALE AND FEMALE SIGN Miscellaneous Symbols OtherSymbol

superscript:

⁰ SUPERSCRIPT ZERO Superscripts and Subscripts OtherNumber
¹ SUPERSCRIPT ONE ¹ Latin-1 Supplement OtherNumber
¹
² SUPERSCRIPT TWO ² Latin-1 Supplement OtherNumber
²
³ SUPERSCRIPT THREE ³ Latin-1 Supplement OtherNumber
³
⁴ SUPERSCRIPT FOUR Superscripts and Subscripts OtherNumber
⁵ SUPERSCRIPT FIVE Superscripts and Subscripts OtherNumber
⁶ SUPERSCRIPT SIX Superscripts and Subscripts OtherNumber
⁷ SUPERSCRIPT SEVEN Superscripts and Subscripts OtherNumber
⁸ SUPERSCRIPT EIGHT Superscripts and Subscripts OtherNumber
⁹ SUPERSCRIPT NINE Superscripts and Subscripts OtherNumber
⁻ SUPERSCRIPT MINUS Superscripts and Subscripts MathSymbol

subscript:

₀ SUBSCRIPT ZERO Superscripts and Subscripts OtherNumber
₁ SUBSCRIPT ONE Superscripts and Subscripts OtherNumber
₂ SUBSCRIPT TWO Superscripts and Subscripts OtherNumber
₃ SUBSCRIPT THREE Superscripts and Subscripts OtherNumber
₄ SUBSCRIPT FOUR Superscripts and Subscripts OtherNumber
₅ SUBSCRIPT FIVE Superscripts and Subscripts OtherNumber
₆ SUBSCRIPT SIX Superscripts and Subscripts OtherNumber
₇ SUBSCRIPT SEVEN Superscripts and Subscripts OtherNumber
₈ SUBSCRIPT EIGHT Superscripts and Subscripts OtherNumber
₉ SUBSCRIPT NINE Superscripts and Subscripts OtherNumber
₋ SUBSCRIPT MINUS Superscripts and Subscripts MathSymbol

fractions:

½ VULGAR FRACTION ONE HALF ½ Latin-1 Supplement OtherNumber
½
¼ VULGAR FRACTION ONE QUARTER ¼ Latin-1 Supplement OtherNumber
¼
¾ VULGAR FRACTION THREE QUARTERS ¾ Latin-1 Supplement OtherNumber
¾
⅓ VULGAR FRACTION ONE THIRD Number Forms OtherNumber
⅔ VULGAR FRACTION TWO THIRDS Number Forms OtherNumber
⅛ VULGAR FRACTION ONE EIGHTH Number Forms OtherNumber
⅜ VULGAR FRACTION THREE EIGHTHS Number Forms OtherNumber
⅝ VULGAR FRACTION FIVE EIGHTHS Number Forms OtherNumber
⅞ VULGAR FRACTION SEVEN EIGHTHS Number Forms OtherNumber

math:

≠ NOT EQUAL TO ≠ Mathematical Operators MathSymbol
± PLUS-MINUS SIGN ± Latin-1 Supplement MathSymbol
±
° DEGREE SIGN ° Latin-1 Supplement OtherSymbol
°
∞ INFINITY ∞ Mathematical Operators MathSymbol
× MULTIPLICATION SIGN × Latin-1 Supplement MathSymbol
×
· MIDDLE DOT · Latin-1 Supplement OtherPunctuation
·
∑ N-ARY SUMMATION ∑ Mathematical Operators MathSymbol
∫ INTEGRAL ∫ Mathematical Operators MathSymbol
∬ DOUBLE INTEGRAL Mathematical Operators MathSymbol
≈ ALMOST EQUAL TO ≈ Mathematical Operators MathSymbol

greek:

Δ GREEK CAPITAL LETTER DELTA Greek and Coptic UppercaseLetter
Δ
θ GREEK SMALL LETTER THETA Greek and Coptic LowercaseLetter
θ
λ GREEK SMALL LETTER LAMDA Greek and Coptic LowercaseLetter
λ
μ GREEK SMALL LETTER MU Greek and Coptic LowercaseLetter
μ
ω GREEK SMALL LETTER OMEGA Greek and Coptic LowercaseLetter
ω

box drawing:

just for fun:

☃ SNOWMAN Miscellaneous Symbols OtherSymbol
☠ SKULL AND CROSSBONES Miscellaneous Symbols OtherSymbol
⍨ APL FUNCTIONAL SYMBOL TILDE DIAERESIS Miscellaneous Technical OtherSymbol
☔ UMBRELLA WITH RAIN DROPS Miscellaneous Symbols OtherSymbol
☕ HOT BEVERAGE Miscellaneous Symbols OtherSymbol
⚰ COFFIN Miscellaneous Symbols OtherSymbol

Unicode v6.*, stuff you're unlikely to see in the wild:

💩
💩
🌃
🌃
🌄
🌄
🌉
🌉
🌞
🌞
🏩
🏩
👙
👙



Ctrl-F to search for a character. <Escape> to clear things from the screen.

If you can't find your character, search here, here or here, or draw here.

Source code here.