Distance from baseline to baseline.

Phototypesetting term for leading.

The spaces between lines of type measured from baseline to baseline. This is measured and specified in points. 1 or 2 point linespacing is considered normal. A common guideline is to use a linespacing equal to the width of the stems of the type face. Negative Linespacing is less than the actual point size. It is also known as leading. The term comes from the bars of lead placed between the rows of characters on the old printing machines.