- Mathematics The symbol (+), as in 2 + 2 = 4, that is used to indicate addition or a positive quantity.
- Chemistry The same symbol, used to indicate dextrorotatory rotation of polarized light.
plus sign - Computer Definition
The plus sign (+) means "ADD" in programming and on calculator keyboards. For example, 10 + 7 means 10 added to 7. It is also used as a concatenation symbol for text fields. For example, city + ", " + state combines the CITY field with a comma, blank space and the STATE field.