Actually it would be something like cxPixels and cxPoints with c meaning "count", x meaning "horizontal" and Pixels/Point being the actual unit. You can see sev

Actually it would be something like cxPixels and cxPoints with c meaning "count", x meaning "horizontal" and Pixels/Point being the actual unit. You can see several Windows structs having this naming convention (the simplest one being SIZE which simply contains cx and cy). EDIT: people often see these as prefixes, but they are not really prefixes, the original paper was about the whole name.