Maybe. **There has been no community consensus as of this revision of this answer**; thus there _should not have been_ any mass-retagging (not yet, anyway).

That said, there are currently 4 questions tagged [tag:signature] (down from 60). They are as follows:

Two about using handwritten signatures in digital documents:

- [How can I add a signature field in a PDF? (not a digital signature)](https://superuser.com/q/485445)
- [How can I sign a PDF document quickly and cheaply?](https://superuser.com/q/137294)

One about using a static image (an “image signature”) as a form of signature analoguous to a handwritten signature:

- [About the security of adding a signature to a PDF file](https://superuser.com/q/515452)

One about the on-filesystem location of signature-related configuration for Microsoft Outlook:

- [Outlook, Config file for users and signatures](https://superuser.com/q/289181)