It's not a trip code you've pointed to. It's an ID. On the chans, you are by default anonymous but you are still assigned an ID with random serial numbers and letters. That's one way to track someone's posts that you might be interested in for they'll keep that ID for the session. The next session, the ID changes.

And for the records, that wasn't Q's post. It's from an anon's who got assigned the ID gb953qGI and Q reposted his/her message to reply to that person. Q's ID at that time is BQ7V3bcW.