A typesetting symbol which has several distinct meanings in mathematics. It is used for a number of purposes.

1. To denote Boundaries between elements in a list, as in .

2. To delimit indices in the element of a matrix, as in (although it is frequently omitted
when implied by context).

3. To indicate the comma derivative of a tensor.

4. In place of a decimal point in continental Europe,
e.g., 3,14159.

## See also

Comma Derivative,

Decimal
Point
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## References

Bringhurst, R. *The Elements of Typographic Style, 2nd ed.* Point Roberts, WA: Hartley and Marks,
p. 275, 1997.## Referenced on Wolfram|Alpha

Comma
## Cite this as:

Weisstein, Eric W. "Comma." From *MathWorld*--A
Wolfram Web Resource. https://mathworld.wolfram.com/Comma.html

## Subject classifications