I apologize for the double post - the original I quoted got deleted and the context was lost. I have seen this police officer show up a few times with people saying he is giving a White Power hand sign. The only one that I could find that made sense was the "23". In the original footage (see link), he is seen asking "three?" repeatedly to another guy in the approaching crowd. I do not think this is a WP incident, just a guy trying to get some information in a non-verbal way.