User Variable creation and deletion

[Bob Frazee]

I created the following user variable in the home screen:
YOU:={1,2,3}
"YOU" shows up in the memory manager as a list and has 1,2,3 in it.

I then attempted to delete it using the "purge()" command.

Defn:
purge(Var) Unassigns a variable name. User manual P-409

Purge(YOU) ---> "No such variable YOU"

Am I missing something?
rcf