High and Low 24h
HIGH_24H refers to the highest price that a cryptocurrency reached within a 24 hour window (usually from midnight to next midnight.)
Conversely, LOW_24H refers to the lowest price that a cryptocurrency reached within a 24 hour window.
For example, Bitcoin reached a HIGH_24H of $33,125 and LOW_24H of $32,991 today.
In markets with high volatility, the high and low of the last 24 hours can exhibit a very large range, while in very calm markets, the range is rather small.