The letter O is used for a number of different purposes in mathematics. The double-struck is sometimes used to represent octonions. The symbols (sometimes called the O-symbol, O-notation, or "big-O") and (sometimes called "little-o") are a type of asymptotic notation collectively known as Landau symbols.

# O

## See also

Landau Symbols, Octonion## Explore with Wolfram|Alpha

## References

de Bruijn, N. G.*Asymptotic Methods in Analysis.*New York: Dover, pp. 3-10, 1981.

## Referenced on Wolfram|Alpha

O## Cite this as:

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