The United States Department of Commerce recommends that the notation 
be used to refer to the binary
logarithm 
(Taylor 1995, p. 33). However,
this practice is not in widespread use.
Lb
See also
Common Logarithm, Lg, Ln, Logarithm, Napierian Logarithm, Natural LogarithmExplore with Wolfram|Alpha
References
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.Referenced on Wolfram|Alpha
LbCite this as:
Weisstein, Eric W. "Lb." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/Lb.html