Great variety exists among both serif and sans serif typefaces. Times New Roman and Garamond are common examples of serif typefaces. Didone fonts are often considered to be less readable than transitional or old-style serif typefaces. The typeface is particularly similar to Syntax, one of Spiekermann's candidate typefaces. Few modern typefaces or fonts include a glyph for the interrobang character. Helvetica is among the most widely used sans-serif typefaces. Similar condensed sans-serif typefaces, often display capitals, became very successful. It has been described as one of the ten most used serif typefaces. Typographers have developed a comprehensive vocabulary for describing the many aspects of typefaces and typography. ITC Zapf Dingbats is one of the more common dingbat typefaces. Armenian print typefaces also include many ligatures. Terminal is a family of monospaced raster typefaces. "Schwabacher" was a blackletter form that was much used in early German print typefaces. Examples of geometric lineal typefaces include Eurostile and Futura. Examples of humanist lineal typefaces include Gill Sans and Optima.