Well I think it goes without saying that you reference the instrument. For instance, I scaled out of the last contract on a 2-lot ES short for 150 ticks total yesterday. I just prefer to work without the dollar figure in the foreground as it places explicit importance on the dollar amount - something traders should be learning to move away from while actually trading. It also gives some idea of the move if traders are also familiar with the same instrument. For performance figures (monthly, weekly, yearly), etc. then dollars might make sense - but percentage might make more sense as well there.