The term 'typewriter typeface size' refers to the size of the font used on a typewriter. The most common size is known as PICA, which is a four-letter word. PICA is an acronym for 'Printer's International Typeface Association', and it is the standard size for typewriters. It is also the size used for most computer fonts. PICA is slightly larger than the other common size, Elite, and is measured in points, with 10 points equaling 1 PICA.