What does the caret (^) character mean in Git?

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HEAD^ means the first parent of the tip of the current branch.

Remember that git commits can have more than one parent. HEAD^ is short for HEAD^1, and you can also address HEAD^2 and so on as appropriate.

You can get to parents of any commit, not just HEAD. You can also move back through generations: for example, master~2 means the grandparent of the tip of the master branch, favoring the first parent in cases of ambiguity. These specifiers can be chained arbitrarily
, e.g., topic~3^2. See related answer to What’s the difference between HEAD^ and HEAD~ in Git?

For the full details, see the “Specifying Revisions” section of git rev-parse --help.

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