Definitions for "Charity Stamp"
see Semi-postal.
Also know as semi-postal. 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.
Sometimes, countries produce stamps with an extra value on them, used to donate to various charities. Some countries, like New Zealand and Switzerland, issues regular charity stamps.