Lg
There are several conflicting meanings associated with the notation 
. In German and
Russian literature, the notation 
is used to mean the common
logarithm 
. This is also the usage recommended by
the United States Department of Commerce (Taylor 1995, p. 33).
However, 
is sometimes identified with the binary
logarithm 
in some number theoretic literature (and here,
mean the base-2 logarithm, not the nested
natural logarithm 
as defined by Ivić 2003).
Great care is therefore needed to determine the intended definition for 
when it is encountered
in the wild.
Ivić, A. "On a Problem of Erdős Involving the Largest Prime Factor of 
." 5 Nov 2003. http://arxiv.org/abs/math.NT/0311056.
Taylor, B. N. Guide for the Use of the International System of Units (SI). United States Department of Commerce. NIST Special Publication 811, p. 33, 1995. http://physics.nist.gov/cuu/pdf/sp811.pdf.
Weisstein, Eric W. "Lg." From MathWorld--A Wolfram Web Resource. http://mathworld.wolfram.com/Lg.html
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