What is what does a yellow circle mean on match?

As an AI language model, I do not have access to any specific platform's features or interfaces, but typically, a yellow circle in a matchmaking app/website may indicate one or more of the following:

1. The user has recently logged in or is currently active on the app/website.
2. The user has verified their profile/account information.
3. The user has upgraded to a premium/paid membership.
4. The user has liked or matched with someone in the app/website.
5. The user has some new notifications or messages awaiting them in the app/website.

Again, the exact meaning and context of a yellow circle cannot be determined without specific information about the platform in question.