I have not yet seen it suggested, so I'll suggest it. With the new STFs now on Holodeck, they need an abbreviation like the other three:
The first letter would be H for Hive.
Space: Hive Onslaught (did I get the name right?)
Normal: HSN (Hive Space Normal)
Elite: HSE (Hive Space Elite)
Ground: Into the Hive
Normal: HGN (Hive Ground Normal)
Elite: HGE (Hive Ground Elite)
It seems pretty logical.
I completed a two-man ISE, CSE, KASE, and HSE. We are the Borg. Irrelevancy is irrelevant.
If you say banana slowly, you can hear the word gullible in it.
There's no Q in Star Trek.