The bulk update request #2590 is pending approval.
remove alias directional_arrows -> directional_arrow
create alias directional_arrow -> arrow_(directional)
create alias directional_arrows -> arrow_(directional)
Just an idea.
Reasons:
1- It would follow the format "simple word (qualifier)". We have bow (weapon) for instance. (instead of weapon bow?)
2- If the tag starts with "arrow", the autocomplete can do the rest.
3- Using "arrow" seems intuitive. It may not be obvious to everyone that we currently use "directional arrow", unless they do some research and read the wikis or something.
Apparently directional arrow was created in topic #2202, from 2009.
Edit: BUR changed as discussed below.
Updated