The weight of a font specifies its boldness. Arranged from lightest to heaviest (more or less):
hairline, extra light, light book, regular, medium demibold, semibold, bold, extra bold, heavy black, ultra, poster
Here is the table, from the file `weight.map'. It is organized alphabetically by abbreviation. Each line consists of an abbreviation and any parts of a PostScript `FontName' which use that abbreviation.
a Thin Hairline b Bold c Black d Demi h Heavy Heavyface j ExtraLight k Book l Light m Medium p Poster r Regular Roman s Semibold u Ultra UltraBlack x ExtraBold ExtraBlack
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