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A Notation for Large Numbers due to Steinhaus (1983) in which 
 is
defined in terms of Steinhaus-Moser Notation as
is
defined in terms of Steinhaus-Moser Notation as  in
 in  Squares.  The particular number known as
the Mega is then defined as follows.
 Squares.  The particular number known as
the Mega is then defined as follows.
 
See also Mega, Megistron, Steinhaus-Moser Notation
References
Steinhaus, H.  Mathematical Snapshots, 3rd American ed.  New York: Oxford University Press,  pp. 28-29, 1983.