Many computer scientists use lg(x)=log(x)/log(2). Most simple calculators use "ln" for the natural log function, and mostly use log(x) for ln(x)/ln(10). At 05:25 PM 2/28/2015, Adam P. Goucher wrote:

I use log(x) for the natural logarithm, log(x)/log(2) for the binary logarithm and log(x)/log(10) for that decimal logarithm that's only ever used for calculating pH values and decibels.