This plural pride symbol was created in October 2011 by Tracee of ouregaiya and/or Iris of Astraea, likely for the Plural Activism group on Yahoo. Ouregaiya originally created the image and shared it widely via email and Livejournal. Astraea then made minor edits with slightly different typography and circles rather than ovals, posting it a few days later.
This design is copyright-free and has no registration or trademark. It is free and open to the public for use by all pluralfolk. You may personalize it with words, colors, etc., but the symbol should remain the same.