Interestingly, there seems to be no such symbol.
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+ is the symbol for adding two numbers together.It is usually called the plus symbol.
Then you take the average of the two middle numbers.Then you take the average of the two middle numbers.Then you take the average of the two middle numbers.Then you take the average of the two middle numbers.
Add the two numbers and divide that by two.
-- Add the two numbers. -- Divide that total by two.
The two numbers could be any of the numbers that you add to get to fourteen.