In the output of git diff, a + symbol indicates that a line has been added in the second branch (or the branch being compared to) compared to the first branch (or the current branch if the first branch name is omitted).
For example, if you see output like this:
+const E = 2.71828;It means that the line const E = 2.71828; has been added in the second branch and was not present in the first branch.
In summary:
-indicates a removal from the first branch.+indicates an addition in the second branch.
This helps you identify what new lines have been introduced when comparing the two branches.
