0x0FF
0x0FF is a hexadecimal numeral literal used in many programming languages to denote the numeric value 255. The digits after 0x are 0, F, F; in hexadecimal, that equals 0*(16^2) + 15*(16^1) + 15*(16^0) = 255.
The value 255 is the maximum for an 8-bit unsigned byte; hence 0x0FF often appears in contexts
In programming, 0x0FF is accepted by languages that use the 0x prefix to indicate hex literals, such
In color-related contexts, each color channel commonly uses values from 0 to 255; 0x0FF represents the highest