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The minus sign − (U+2212 − MINUS SIGN) glyph is generally set a little higher, so as to be level with the horizontal bar of the plus sign. In informal usage, the hyphen-minus - ( U+002D - HYPHEN-MINUS ), provided as standard on most keyboards, is often used instead of the figure dash.
The less-than sign is a mathematical symbol that denotes an inequality between two values. 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. In mathematical writing, the less-than sign is typically placed between two values being compared ...