In mathematics, Steinhaus-Moser notation is a notation for expressing certain extremely large numbers.

Balanced hyperoperations, first considered by Clément Frappier in 1991, are based on the iteration of the function , and are thus related to Steinhaus-Moser notation.

Steinhaus-Moser notation; apart from the method of construction of large numbers, this also involves a graphical notation with polygons; alternative notations, like a more conventional function notation, can also be used with the same functions.

In pure mathematics, the magnitude of a googolplex could be related to other forms of large-number notation such as tetration, Knuth's up-arrow notation, Steinhaus-Moser notation, or Conway chained arrow notation.