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A comprehensive table of symbols used in logic, with their names, readings, categories, explanations, and examples. Includes basic logic symbols, such as ⇒, ⇔, ¬, ∧, ∨, and ⊕, as well as symbols for propositional logic, Boolean algebra, and other fields.
Learn about the history, usage and meaning of the plus sign (+) and the minus sign (−) in mathematics and other fields. Find out how they are derived from Latin letters, how they are written in different languages and symbols, and how they are used as operators, functions and prefixes.
A dagger, obelisk, or obelus is a typographical mark that usually indicates a footnote or marks a critical or highlighting indicator in manuscripts. Learn about the origin, variations, and modern usage of this symbol from ancient to modern times.
Learn how to insert en dashes, em dashes, and minus signs on Wikipedia using various methods, including copy and paste. Find examples, templates, HTML codes, and keyboard shortcuts for different platforms.
In mathematical formulas, the ± symbol may be used to indicate a symbol that may be replaced by either of the plus and minus signs, + or −, allowing the formula to represent two values or two equations. [2] If x 2 = 9, one may give the solution as x = ±3. This indicates that the equation has two solutions: x = +3 and x = −3.
Alt code is a method of entering characters that do not have a dedicated key combination on the keyboard, using the Alt key and a numeric code. Learn how Alt code works on different operating systems, code pages, and Unicode, and see a list of common codes.
Keyboard shortcuts make it easier and quicker to perform some simple tasks in your AOL Mail. Access all shortcuts by pressing shift+? on your keyboard.. All shortcuts are formatted for Windows computers, but most will work on a Mac by substituting Cmd for Ctrl or Option for Alt.
Learn about the history and origin of the symbols for the classical planets, the major planets discovered in the modern era, and the asteroids and centaurs. See how the symbols evolved from ancient Greek and Egyptian sources, alchemical and astronomical signs, and medieval codices.