What organization is represented by this pin insignia? There appears to be three slightly different designs. It is worn by Steve Bannon, the former Breitbart editor and current trump advisor, during a White House meeting on policy. I was unable to find the significance online.
That badge was one of a mysterious and ever changing variety of temporary event passes issued to VIPs guarded by the US Secret Service. It's not unlike a hand stamp at a nightclub, (which helps bouncers know who to admit), or a color coded ticket stub given at a movie theater.
In future decades the current series of USSS badges may become rare collectibles, like old stamps. At present however, there appears to be no thorough online catalog, perhaps through a spirit of public and official cooperation, and because such badges are believed to be much more useful to their wearers if there is no such catalog.
Note: In the spirit of maintaining minority obscurity, this answer contains no URLs whatsoever to any corroborating sources with pictures.