postage stamp sold for more than its face value, with a portion of the difference between face value and sale price donated to a specified charitable activity. The first semi-postal (Breast Cancer Awareness) appeared in 1998. Scott numbers begin with B.
A stamp sold at a price greater than postal value, with the additional charge dedicated for a special purpose. Usually recognized by the presence of two (often different) values, separated by a "+'' sign, on a single stamp.
Stamps with an additional charge to raise money for charity. Cat. Designation: "B"