A notation for large numbers defined by Steinhaus (1983, pp. 28-29). In this notation, 
denotes
,
denotes "
in 
triangles," and 
denotes "
in 
squares." A modified version due to Moser eliminates
the circle notation, continuing instead with polygons
of ever increasing size, so 
in a pentagon is 
with 
squares around it, etc.
Steinhaus-Moser Notation
See also
Circle Notation, Large Number, Mega, MoserExplore with Wolfram|Alpha
References
Steinhaus, H. Mathematical Snapshots, 3rd ed. New York: Dover, 1999.Referenced on Wolfram|Alpha
Steinhaus-Moser NotationCite this as:
Weisstein, Eric W. "Steinhaus-Moser Notation." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/Steinhaus-MoserNotation.html