Admin indicators, and gold crowns on user avatars
If the members are on a team or board page, you'll see two types of indicators to indicate an administrator status and Trello Gold membership.
A blue indicator tells us that the user is an administrator of that board (if on a board page) or team (if on team page).
A gold crown tells us that the user has a Trello Gold membership. This gives the user additional non-essential (but really fun!) Trello features. To learn more about Trello Gold visit https://trello.com/gold .