Indeed. It's a relay that whitelists who can post to it based on your web-of-trust. In most cases, that is defined as the nostr:npubs you follow + the nostr:npubs they follow.

The one I am running is nostr:npub1utx00neqgqln72j22kej3ux7803c2k986henvvha4thuwfkper4s7r50e8's WoT Relay that can be found here: https://github.com/bitvora/wot-relay

This implementation has the advantage that it can aggregate notes from those within your web-of-trust by pulling from the relays they write to. You can also limit the amount of time they will be stored on your relay and exclude certain users' follows from your web-of-trust if you notice that they have been duped into following bots.

UTXO calls this last feature the "Retard List." My retard list keeps growing...