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The plus sign (+) is a binary operator that indicates addition, as in 2 + 3 = 5. It can also serve as a unary operator that leaves its operand unchanged ( + x means the same as x ). This notation may be used when it is desired to emphasize the positiveness of a number, especially in contrast with the negative numbers ( +5 versus −5 ).
The only variant that exists is an alternative plus sign, which is a plus sign which looks like an inverted capital T. Unicode has this symbol at position U+FB29 "Hebrew letter alternative plus sign" (﬩). The reason for this practice is that it avoids the writing of a symbol "+" that looks like a Christian cross.
In mathematical formulas, the ± symbol may be used to indicate a symbol that may be replaced by either the plus and minus signs, + or −, allowing the formula to represent two values or two equations. [2] If x2 = 9, one may give the solution as x = ±3. This indicates that the equation has two solutions: x = +3 and x = −3.
The plus sign + (itself based on an et-ligature) is often informally used in place of an ampersand, sometimes with an added loop and resembling ɬ. [citation needed] Other times it is a single stroke with a diagonal line connecting the bottom to the left side. This was a version of shorthand for ampersand, and the stroke economy of this version ...
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A ⊂ B {\displaystyle A\subset B} may mean that A is a proper subset of B, that is the two sets are different, and every element of A belongs to B; in formula, A ≠ B ∧ ∀ x , x ∈ A ⇒ x ∈ B {\displaystyle A eq B\land \forall {}x,\,x\in A\Rightarrow x\in B} . ⊆. A ⊆ B {\displaystyle A\subseteq B}
The symbol # is known variously in English-speaking regions as the number sign, hash, or pound sign. The symbol has historically been used for a wide range of purposes including the designation of an ordinal number and as a ligatured abbreviation for pounds avoirdupois – having been derived from the now-rare ℔ .
The sign is, however, provided in Unicode, as U+2265 ≥ GREATER-THAN OR EQUAL TO ( ≥, ≥, ≥ ). In BASIC, Lisp -family languages, and C -family languages (including Java and C++ ), operator >= means "greater than or equal to". In Sinclair BASIC it is encoded as a single-byte code point token.
The plus sign indicates the subject still alive at the end of the study. The researcher wished to determine if the median survival time was less than or greater than 200 weeks. The null hypothesis is that median survival is 200 weeks. The alternative hypothesis is that median survival is not 200 weeks.
U+FF05 ％ FULLWIDTH PERCENT SIGN. U+FE6A ﹪ SMALL PERCENT SIGN. U+066A ٪ ARABIC PERCENT SIGN, which has the circles replaced by square dots set on edge, the shape of the digit 0 in Eastern Arabic numerals. U+332B ㌫ SQUARE PAASENTO, パーセント ( pāsento, from English "percent") in one square character.