WordReference Random House Unabridged Dictionary of American English © 2020
sign of aggregation, [Math.]
  1. Mathematicsany of the signs used to indicate grouping in an algebraic expression: vinculum, bar, or raised horizontal line, &aspplusspbhorbarover;
    ;
    a pair of parentheses, (a + b);
    a pair of brackets,
[a + b];
or a pair of braces, {a + b}
.
  • 1940–45

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