A notation for large numbers due to Steinhaus (1999). In circle notation, is defined as in squares, where numbers written inside squares (and triangles) are interpreted in terms of Steinhaus-Moser notation. The particular number known as the mega is then defined as follows (correcting the typographical error of Steinhaus).

Steinhaus, H. Mathematical Snapshots, 3rd ed. New York: Dover, pp. 28-29, 1999.

CITE THIS AS:

Weisstein, Eric W. "Circle Notation." From MathWorld--A Wolfram Web Resource. http://mathworld.wolfram.com/CircleNotation.html