The letter C itself, used in alphabet listings, abbreviations, or as a symbol.
The letter C is read as 'shii'.
Abbreviation for Celsius temperature scale, often used in weather reports or scientific contexts.
Today's temperature is 25°C.
cyan
Refers to the color cyan, often in printing or design contexts (CMYK).
The cyan ink of this printer has run out.
He wrote an OS in C.