I’m not sure where this first started, but it deserves to be adopted into the general vocabulary of the forum.
retard: re•tard [ri-tahrd, ree-tahrd]
1. A gathering or 2 or more ninjers, training, discussing, or otherwise role playing together: A school of fish, a herd of cattle, a retard of ninjers
1. The grouping of ninjers into a retard: the ninjers are retarding for the annual Taikai