In the game RuneScape were it means Unidentified Herb (a herb which has not been identified). You can identify the herb and then it will become a herb which you can use to make usefull potions in which then can boost your stats, cure you from poison or give you energy.
A: I picked up a unid some newb dropped and it was a ranarr
B: Can you plz id my unid
C: Selling unids 1k ea