Kloc

The formula is based on thousands of lines of source code (kLOC) and incorporates Fagan's recommendations for inspection pace, meeting duration, and frequency: elapsed time (in days) = 3 × n kLOC Here n is an estimate of how many thousands of lines of code will be inspected.

It concludes that defects are found 2 to 4 times faster with inspection than with testing, that defects are typically found at the rate of one defect per man hour invested in inspection, and that inspection finds about 37 defects per kloc if it is done properly.

In IBM there's a religion in software that says you have to count KLOCs, and a KLOC is a thousand line of code.