Plus may refer to any of the following:
1. When referring to a keyboard or symbol, the plus ( + ) is a symbol found on the same key as the equal sign that has a horizontal and vertical line crossing each other. In the picture to the right is an example of the plus symbol.
Where is the plus key on the keyboard?
Below is an overview of a computer keyboard with the plus key highlighted in blue on the main keyboard as well as the numeric keypad.
How to create the + symbol
Creating the + symbol on a U.S. keyboard
The plus is easier to use on the numeric keypad with math formulas.
Creating the + symbol on a smartphone or tablet
What is a plus used for on a computer?
The plus key is most often used in programming and mathematics to add two or more numbers or as a programming operator.
Plus in a math formula
In a math formula a plus is used to represent an addition. For example, in the below formula you can see that 2 <plus> 1 is equal to 3.
2 + 1 = 3
A plus in a URL
Plus in a shortcut key
When describing a shortcut key, the plus symbol is used to indicate two or more keys pressed at the same time. For example, Ctrl+A indicates pressing the Ctrl key and the "a" key at the same time to select all text. The plus may also be used as a shortcut. For example, in your browser and other programs with zoom support you can press the Ctrl key and the plus key at the same time to zoom in on text or an image.
A plus in a regular expression
With a regular expression, a plus is used to match one or more times. For example, in the below regular expression, all occurrences of the letter "z" in the $example variable would be replaced with a single letter "a." In other words, "z" would become "a," "zz" would become "a," "zzz" would become "a," etc.
$example =~ /z+/a/g;
Increment a variable in programming
Two pluses next to each other in programming is a shorthand method of incrementing a variables value. For example, if you had a variable called $count that was equal to "10" and you wrote $count++; in many different programming languages it would increment by one and become "11."
Other places with the plus symbol
2. Plus is also an abbreviated version of Google+.