TPO (time price opportunity)
One mark for each price bucket a 30-minute period traded through; stacked, the marks show how long the market spent at each price.
A TPO, time price opportunity, is the unit Market Profile counts. The day is cut into 30-minute periods, and each period leaves one mark on every price bucket its range touched, however many trades happened there. Stacking the marks of all periods gives the profile: a long row is a price the market kept coming back to, a short row a price it passed through quickly. How to read it: a TPO counts time, not volume, so a price with many marks and little volume was accepted but thinly traded; that is why our table carries the volume point of control next to the TPO one. The TPO profile of each closed day is on the symbol pages.