1 Twip is exactly one twentieth (1/20) of a PostScript point. A PostScript point itself being 1/72 of an inch, making a twip 1/1440 inch. 1 Twip is approximately 1.763889 x 10-5 meters (SI base unit). 1 twp ≈ 0.000017638888888889 m.
Furlong is a measure of distance of 660 feet; also equivalent to 220 yards, 10 chains, and one-eighth of a mile. Originating from the length of one furrow plowed along the longest side of an acre, measuring 660 feet. 1 furlong = 201.168 meters.