/rho
Set their holding object to the same as the specified players holding object (if any)
In the game
Usage: /refreshholdingobject <PlayerID/Name> [Optional:HoldingSlotID=0]
Allows you to set your holding object to the same as the target player (if any).
Note: any existing holding object you have in the same holding object slot will be removed.
The shortcut for this command is: /rho
What it does
Not explained in detail yet.
Wiki