BUR #50113 has been approved by @evazion.
create alias arm_band -> armband
Reverses an unalias from forum #395941. As pointed out in forum #396116, this is a useful alias if people want to find a specific type of band and type just "band" to try and find it. arm band was arbitrarily determined as a bad alias and shoveled into a large BUR without ample time to discuss how poorly thought out it was, citing only "autocomplete improvements" as the reason for removing them without considering mistypes, alternate spellings or the common English issue of compounding two words into one or vice versa. You can't even fuzzy search it anymore because "band" doesn't pull up armband anymore.
This alias doesn't interfere with autocomplete at all - in fact, unthoughtfully removing some aliases actually degrades autocomplete and workflows more than it helps. There are larger tags starting with "arm" enough to not let this alias displace those results (consider armsleeves, armpits, armor) and multiple band tags which retain their spaced aliases as utility/search quality improvements (consider hair band, thigh band, head band).
This is a core reason why I don't like massive BURs that handle a bunch of unrelated things all at one time. One bad line can tank a BUR, and in this case it should've, but it was approved too fast and people like me who would've disagreed with it hadn't yet showed up to comment on it. I only took notice after another mega BUR was submitted that attempts to remove similarly useful aliases and had it pointed out. It's not too hard to end up missing a (bad) BUR in a megathread, even as someone who reads nearly every forum post.