A single print column that appears at the bottom of a market profile structure. The tail is usually made up of at least three or more TPOs. It is formed as a result of sellers drying up and not being present in high enough numbers to continue to move prices lower once they have fallen to an area that market participants perceive as an unfair low for the session. As the lack of sellers brings a strong imbalance of buying activity in reaction to the low price levels, prices quickly reverse higher, leaving the single print tail in their wake. It should be noted that these areas usually include the taper of volume in the futures market as volumes at each price level get less and less the closer you get to the low of the tail.