ASCII does not encode either of these signs, though they are both included in Unicode. The double less-than sign, <<, may be used for an approximation of the much-less-than sign ( ≪) or of the opening guillemet ( «). Less-than plus ampersand ( <&) is used to redirect from a file descriptor. Less-than sign is used to redirect input from a file. In Bourne shell (and many other shells), operator -lt means "less than". means "less than" later versions allow <. In BASIC, Lisp-family languages, and C-family languages (including Java and C++), comparison operator < means "less than". ASCII does not have angle brackets but are standard in Unicode ( U+2329 〈 LEFT-POINTING ANGLE BRACKET). The less-than sign may be used for an approximation of the opening angle bracket, ⟨. The less-than sign, <, is an original ASCII character (hex 3C, decimal 60). Since the development of computer programming languages, the less-than sign and the greater-than sign have been repurposed for a range of uses and operations. Examples of typical usage include 1⁄ 2 < 1 and −2 < 0. In mathematical writing, the less-than sign is typically placed between two values being compared and signifies that the first number is less than the second number. The widely adopted form of two equal-length strokes connecting in an acute angle at the left, <, has been found in documents dated as far back as the 1560s. The less-than sign is a mathematical symbol that denotes an inequality between two values. U+2A7D ⩽ LESS-THAN OR SLANTED EQUAL TO used e.g.
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