a ˙ , a ¨ , a ´ , a ` {\displaystyle {\dot {a}},{\ddot {a}},{\acute {a}},{\grave {a}}}
∈ ∉ ∩ ∪ ⊂ ⊃ ⊆ ⊇ ¬ ∧ ∨ ∃ ∀ ⇒ ⇔ → ↔ ↑ ↓ ℵ - – —
