What's the meaning of $\dagger$ In some books I've seen this symbol $\dagger$, next to some theorem's name, and I don't know what it means. I've googled it with no results which makes me suspect it's not standard. Does anybody know what it means? One example I'm looking at right now is in a probability book, next to a section about Sitrling's approximation to factorials: > **Stirling's formula ($\dagger$)** FOUND IT: The preamble says they're historic notes, it actually makes a historic introduction in the section about Stirling's formula, inc ase anyone's wondering.

From Wikipedia: "While the asterisk (asteriscus) was used for corrective additions, the obelus was used for corrective deletions of invalid reconstructions".

The obelus, which is the "cross", is similar to the asterisk but is used for making corrections instead of additions.

Edit: I don't know if this would necessarily be the correct context without further information (of what follows the cross).