pc
The pica: twelve points at once, inherited from the composing rooms.
One pc is a pica: twelve points, a sixth of an inch. It was the ruler of newspaper layout — columns so many picas wide, leading so many points deep — and it entered CSS along with the rest of the typographic kit.
Today it may be the least-typed unit in the standard: those who print think in millimeters or points, those who design for screens think in pixels. The pica survives the way movable type survives — stored, oiled, and almost never called for.
.coluna {
width: 14pc;
}