Learning to Read the DOM

Hello,
I’m new to DOM and was wondering what the number that prints at each level next to the price in the middle column represents? I’m assuming its not volume traded because i rarely see it go above 10 at certain times. Any help would be appreciated!

I would more explanation about the TV DOM. I like TV but their education videos only cover the obvious.

hi. one side is the bid and the other is the offer contracts. try using the histogram on the dom too. its helpful also. good luck with your trading.