Speedo

Until 1991, X fonts were pre-rendered bitmaps in BDF and PCF, one file per size. If you wanted 13 point and only had 12 and 14, you lived with it. With X11R5 Bitstream contributed a rasterizer for its own format, along with Charter and Courier in four faces each, and the server could suddenly render any size from a .spd file. The XLFD name advertised this with zeros in the size fields: -bitstream-charter-medium-r-normal--0-0-0-0-p-0-iso8859-1.

Charter had been drawn by Matthew Carter in 1987 for low-resolution printers, which happened to make it an unusually readable screen face. The format itself, though, was Bitstream's alone and never stood a chance of becoming the standard: Type 1 and later TrueType won, and X.Org dropped Speedo support in the late 2000s, long after Xft and Fontconfig had moved rasterization out of the server altogether.