Liquidity void, Fair Value Gap, Imbalance... These terms are interchangeable.
As a Charter Member ill tell you what I've shown here, is a basic depiction, as I got asked a question on what is an imbalance?
An imbalance, is an imbalance in price, where price has NOT efficiently delivered orders in the market, price will like to revisit these areas, of imbalance, as seen here. The diagram on the left depicts the ideal model of what an imbalance is, the chart on the right is an in time example.
if you notice one of these getting filled, at a place where you are bearish/bullish... well.... there is your trade!