Basically, this command would show how many of a player's head exist in the game.
You would type /heads , and a message would appear saying something like "There are of 's heads in existence."
Example:
I would type:
/heads Fuzzlr
And the server would reply:
There are 7 of Fuzzlr's heads in existence
This would be useful for knowing how many of a head are out there, and also for determining the price of a head, as part of a head's price is based on it's rarity.
If this has already been suggested before, sorry!