running foot >
another name for a linear foot. Terms such as running meter and running yard are used similarly.

linear foot (or "lineal" foot) (ft or lf) >
terms used loosely to describe a one-foot length of any long, narrow object. The correct term is linear foot; the word "lineal" refers to a line of ancestry, not to length. Boards, pipes, and fencing are typical objects measured and sold by the linear foot. In the moving industry, a linear foot is a one-foot length of a moving van, usually a volume of about 72 cubic feet (roughly 2 cubic meters). Occasionally the term "linear foot" is used as an alternate name for the board foot, but this is appropriate only if the board is 12 inches wide. Terms such as linear meter and linear yard are used in a similar way to indicate one-meter or one-yard lengths.

(http://www.unc.edu/~rowlett/units/dictR.html)