This triangle-shaped stamp has an unusual purpose

"The triangle Postcrossing stamp from the U.S. Postal Service commemorates an international pen pal project started in 2005 by Paulo Magalhães, a student in Portugal. The program connects people around the world in a simple but increasingly old-fashioned way: Send a postcard, get one back."

"Today, more than 805,000 people from more than 200 countries and territories have sent more than 80 million postcards through the program. Americans have sent more postcards through Postcrossing than the residents of any country except Germany."

"The latest triangular stamps feature artwork by Arizona-based artist and designer Jackson Gibbs. Known for his editorial work in outlets like The New York Times and New York magazine, Gibbs says the creative brief for his first-ever stamps was to portray the activity of postcrossing."

The U.S. Postal Service has introduced a triangle-shaped stamp for the Postcrossing project, which began in 2005. This initiative connects individuals worldwide through postcard exchanges. Over 805,000 participants from more than 200 countries have sent over 80 million postcards. The U.S. has sent nearly as many postcards as Germany. The new stamp follows a successful letter-writing campaign to the USPS Citizens' Stamp Advisory Committee. The stamps feature artwork by Arizona artist Jackson Gibbs, showcasing the playful nature of sending postcards.

Read at Fast Company