The name Elmarit is used by Leica to designate camera lenses that have a maximum aperture of f/2.8.
The Elmarit is a derivation of the Elmar. Confusingly not all f/2.8 lenses are Elmarits. The 50 mm f/2.8 collapsible, manufactured until 2007, was designated an Elmar rather than an Elmarit.
The Elmarit are popular lenses for extreme focal lengths: 21 mm, 24 mm, 28 mm and 90 mm. The Elmarit has also come in 135mm super-telephoto.
The Elmarit are behind the Summicron and the Summarit lenses. Only the Elmar and most Summaron lenses have a smaller f-number.