∪
Union
The set union operator: A ∪ B is the set of elements in either A or B. The cup shape opens upward — a common mnemonic is “U for union”. Never substitute the letter U, which has different width and baseline behavior. Appears in probability (P(A ∪ B)), SQL documentation, and interval notation for disjoint ranges.
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- Symbol
∪ - Unicode
U+222A - HTML entity
∪ - CSS content
\222A - JavaScript
\u222A - URL encoded
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