The phrase "badge holders" refers to people who wear or carry a special card or identification badge to show their affiliation or authorization for a certain purpose or access to a specific place. Full definition
There is a parking bay directly in front of the gallery with parking for blue badge holders for up to three hours between 10 am and 1 pm. (southlondongallery.org)
2 additional spaces are reserved for disabled blue badge holders. (sport.ox.ac.uk)
Respiratory Therapy Badge Reel Personalized Name (15 Choices), ID Badge Holder, Medical Badge Reel, Belt or Alligator clip, RT Badge Reel (etsy.com)