Rafter (typography)

See also: Rafter

The rafter is a punctuation mark also called hook obliques and in the past, anti-lambda (capital letter Lambda, Λ, round of a quarter of turn on the left or on the right). The rafters are at the origin of the Guillemet S known as “French” (“and”).

Philological use

In Philology, for the scientific edition of a text, the rafter generally marks the words or groups words added in the text by conjecture. The gaps can also be indicated by a group of three Astérisque S surrounded by rafters (< *** >). One traditionally allots the use of the rafter to the Greek grammairien Aristarque de Samothrace (second century BC), which uses it to indicate a critical note.

Unicode definitions

Mathematical use

In mathematics, it is a symbol which can mean:

  • < is smaller than
  • > is larger than
or
  • < order ascending
  • > decreasing order

Example:

  • 100 < 120: 100 is lower than 120
  • 120 > 100: 120 is higher than 100
or
  • references between 100 < 120 will be for the dresses
  • the references between 99 > 50 will be for the pants

The two rafters are also used to note the scalar product, or to announce a presentation of a group finiment generated.

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