200 IB Rotation Targets
Based on market profile, these levels are initial balance rotation targets of 200% the initial balance.
So if the initial balance is 10 handles wide, the target would be for a 20 handle day range, so you'd look to exit or fade when you add 20 handles to the initial balance low or subtract 20 from the highs.
These have been shown to be high probability reversal areas when hit intraday for a reversal back to balance.