Use of a gift to perpetuate memory of an individual, family, firm, or organization; by receiving a gift, the institution commits itself to honor the name in an appropriate form Topic areas: Fundraising and Financial Sustainability
A stamp printed in a limited quantity and available for purchase for a limited time The design may note an anniversary associated with an individual, an historic event, or a national landmark See also Definitive
There are basically two types of postage stamps - commemmorative and definitive commemorative stamp is one that is issued for a short time and which has an underlying special theme or subject : honour or commemorate anniversaries, important people or special events