Volume Profile Indicator Explained. Volume Profile Indicator Explained. Let’s start with, VPI that’s stands for Volume Profile Indicators, and it is a volume-based indicator. That calculates the number of shares traded in a specific time period and plots them on a trend chart. The Volume Profile Indicator is one of the indicators used to determine the angle of support and resistance pressures. It can also be used to spot breakouts, continuation patterns, and early trend change signs. The visual representation is made up of a line that runs from the past to the present, giving traders an idea of overall volume throughout that time. Traders can use the indicator to measure the strength of support and resistance levels, as well as review