BUR #2118 has been approved by @Hillside_Moose.
create alias multiple_arms -> extra_arms
Reason: The distinction between multiple_arms and extra_arms depends on whether the additional arms are "normal" or "abnormal", respectively. That isn't a good basis for tagging.
With respect to realistic settings and human bodies, having more than two arms is automatically abnormal. In this sense, multiple_arms as defined do not exist, except possibly for non-vertebrate animals like octopi, squid, and starfish. On the other hand, with respect to fantasy settings where mutants, monster girls, and machamps are running about, the notions of what is normal and abnormal break down.
Also, multiple_arms is poorly named. In general usage "multiple" is understood to mean "more than one", so "multiple arms" would seem to include the normal case of two arms. It's possible that it was meant to apply to arms that are properly bilaterally symmetric, in which case it should probably be "multiple pairs of arms".
EDIT: The bulk update request #2118 (forum #159925) has been approved by @Hillside_Moose.
Updated by DanbooruBot