OK, now that we were barred from using OTR accronym, my new suggestion is mpSeQ, motivation:
1. so sound mpSec for multiparty secure (messaging). I believe we are doing more than just being off the record (authentication, consistency, etc). Being provably deniable is just another security aspect of the protocol. 2. eQ for equalit.ie. 3. It might be used for more than instant messaging, so more like multiparty communication or collaboration. So "messaging" part is less crucial to appear in the name.