It depends in your context. If its in certain terms you can get the answer from your local library.
IT STAND FOR
It stands for Water Closet.
You will have to call S&W.
You must call S&W to find out.
5040 columns in a word processor
5*100 = 500 c+c+c+c+c = D
5 stars on a Chinese flag.
five cents in the pound
5 continents in the world xx ------------------------------------------ ...but there's six continents... :\
W/c .4/5
0 =Freezing Point ofWater on Celcius Scale.;)
It might stand for several things, of course. For one, "C" is 100, and "D" is 500, in Roman Numerals, so it might mean "5 hundreds in a 500".