It signifies a "conformed signature": a legal way to sign an electronic document using a typed signer's name instead of an actual signature.

I think it makes more sense when you consider how many circumstances in which we do handwritten signatures, yet the recipient of the signature has no intent or method to verify it against your usual signature

>I put the damn thing in quotes for a reason

I don't remember when Google stopped honoring the "..." convention but it's very annoying

Signature.