Rate-Of-Change : (price-prevPrice)/prevPrice (ROCP)

Interpretation / Algorithm
Description with math formula [FMLabs.com]
Technical Analysis Studies [prophet.net]

Product Implementation	Function / Formula / Script / Source Code
TA-Lib [ta-lib.org]	C/C++ Source Code - TA_ROCP()

Related Links
Rate Of Change (ROC) by Shaun Taylor [investopedia.com]