Glyph origin
From a ligature of Latin et (“and”). Compare & and ⁊ of same meaning.
Symbol
+ (English symbol name plus sign or plus)
- (arithmetic, algebra) Addition, additive operation.
- 3 + 2 = 5
- (mathematics) Explicitly indicates that the next number is positive.
- +5 is different from −5
- (informal) "Or more"; indicates that a number is the minimum quantity or amount.
This project is going to take 10+ years to complete. (10 or more years)
- (mathematics) From the positive side.
is the same as 
- (mathematics) A disjoint union, a coproduct.
- (mathematics, logic) An inclusive disjunction.
- (genetics) A wild type.
- (botany) A grafted hybrid.[1]
- (programming) A string concatenation in some programming languages (that might be ambiguous with an additive operation).
"My name is " + name + ". I am " + age + " years old."
- (regular expressions) Detects one or more occurrences of the preceding element.
- The string
ab+c matches "abc", "abbc", "abbbc", and so on, but not "ac".
- (chess notation) Check.
- A placeholder standing for the international call prefix in phone numbers.
Sure, call me if you want. My number is +496919725.
- (medicine) An affirmative result from a laboratory test.
- (electricity) An anode.
- Indicating north.
- (music) Augmented.
- (Roman Catholicism) Written by a bishop before his signature.
Usage notes
- The + symbol is called the plus sign in English (see there for translations).
Antonyms
- (antonym(s) of “addition or positiveness”): - or −, sometimes ÷
References
Simpson, Niki (2010 February) “Botanical symbols: a new symbol set for new images”, in Botanical Journal of the Linnean Society, volume 162, number 2, →DOI, archived from the original on 2021-12-19, pages 117–129
