Little yellow map pin

The little yellow map pin was sent to new members stuck in a piece of cardboard.

Traditionally, a little yellow map pin (sometimes abbreviated "LYMP"), worn in a member's lapel, was the "secret" symbol of Mensa membership intended to enable Mensans to recognize one another upon meeting by chance. For many years, such a pin was included in the new-member packet sent to those joining American Mensa, and perhaps some other national Mensas did it as well. However, the custom of wearing them gradually went into disuse.