Dagger
On Windows, hold Alt and type 0134 on the number pad, then let go of Alt.
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About the dagger
In a family tree or a list of names, † beside a person means they have died, as in †1850, and biologists put it beside extinct species. In footnotes it usually comes second, once the asterisk has been used.
It descends from the obelus, the mark that ancient Greek scholars set beside lines of Homer they suspected were not genuine.