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is true only if both A and B are false, or both A and B are true. Whether a symbol means a material biconditional or a logical equivalence , depends on the author’s style. x + 5 = y + 2 ⇔ x + 3 = y {\displaystyle x+5=y+2\Leftrightarrow x+3=y}
Typographical symbols and punctuation marks are marks and symbols used in typography with a variety of purposes such as to help with legibility and accessibility, or to identify special cases. This list gives those most commonly encountered with Latin script. For a far more comprehensive list of symbols and signs, see List of Unicode characters.
HTML and XML provide ways to reference Unicode characters when the characters themselves either cannot or should not be used. A numeric character reference refers to a character by its Universal Character Set/Unicode code point, and a character entity reference refers to a character by a predefined name.
Primarily for compatibility with earlier character sets, Unicode contains a number of characters that compose super- and subscripts with other symbols. [1] In most fonts these render much better than attempts to construct these symbols from the above characters or by using markup.
The caret symbol can be written just below the line of text for a punctuation mark at low line position, such as a comma, or just above the line of text as an inverted caret (U+02C7 ˇ CARON) for a character at a higher line position, such as an apostrophe, or in either position to indicate insertion of a letter, word or phrase; [3] the ...
The Miscellaneous Mathematical Symbols-B block (U+2980–U+29FF) contains miscellaneous mathematical symbols, including brackets, angles, and circle symbols. Miscellaneous Mathematical Symbols-B [1] Official Unicode Consortium code chart (PDF)
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The closing single quotation mark is identical in form to the apostrophe and similar to the prime symbol. The double quotation mark is identical to the ditto mark in English-language usage. It is also similar to—and often used to represent—the double prime symbol. These all serve different purposes.