Plus may refer to any of the following:
1. When referring to a keyboard or symbol, the plus ( + ) is found on the same key as the equal sign. As pictured here, it is depicted as a horizontal and vertical line that cross exactly at the center.
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 and 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, 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."
2. Plus is also an abbreviated version of Google+.