Leather Pride Flag
From wipipedia.org
The Leather Pride Flag is a symbol for the BDSM subculture.
The flag was designed by Tony DeBlase, and he first presented the design at the International Mister Leather contest in Chicago, Illinois, USA on May 28 1989. The original prototype flag is now on display at the Leather Archives and Museum in Chicago.
Although the flag is often common in the gay community, it is not a "gay-only" symbol and represents the entire leather community. The Leather Pride Flag is not copyrighted and is in the public domain.
The triskelion is another symbol which has been adopted as an emblem by some BDSM groups, and together they form the composite BDSM Rights Flag.