INDICATOR NAME CLASS* UNIT VALUE i inch abs 1 inch<\n> c centimeter abs 1 centimeter<\n> p point abs 1/72 inch<\n> P pica abs 1/6 inch (12 points)<\n> m em rel current font size in points<\n> n en rel 1/2 em<\n> M <\#147>emette<\#148>** rel 1/100th of an em<\n> v leading rel current vertical spacing in points<\n> u basic unit dev device resolution [1/72000 inch]<\n> z sizescale dev basic units per point [1000]<\n> Notes: * Scale units are classified according to whether the unit represents an absolute unit of measure, is relative to the current pointsize/leading or is device dependent (values in brackets are applicable for PostScript devices). ** A groff extension (as is the <\#147>z<\#148> unit); the name given here is contrived by the author.