Convert from point [Adobe] to mark twain

Unit Definition (point [Adobe])
A point is a unit of measure in typography (Abbreviated as "pt"). There are various sorts of points, used in particular locations and times: * Fournier point: the first definition of the printer's point, by Pierre Fournier. It was 0.34882 millimetres, which was 1/12 of a cicero.

Unit Definition (mark twain)
The mark twain or twain is an old word for the number two, derived from the Anglo-Saxon twegen. The American author Samuel Clemens (1835-1910), who had been a riverboat pilot on the Mississippi in his youth, took his literary name from a traditional riverboat phrase "mark twain", meaning "exactly two" fathoms of water. This was the minimum depth needed for the boats to operate safely without running aground.