Handy Unicode symbols

Typography

ndash: –

Quotation marks

Czech „double“ ‚single‘

English “double” ‘single’

Math

Sets: ∩ ∪ ∅ ∈

Logic: ∧ ∨ ∀ ∃ ∄

Arrows

←↑→↓↖↗↘↙↔↕ ⇠⇡⇢⇣ ⇦⇧⇨⇩

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Links

Wikipedia: Mathematical operators and symbols in Unicode

Interesting reading about Unicode: