signature block
noun
1Originally Printing a block of text, illustrations, etc., used to represent a company, organization, or person, especially as printed at the bottom of an advertisement or letter; a printing block engraved with text of this sort; (in later use also) Computing = sense A. 3c.
2A blank space at the end of a document, contract, etc., in which a person may sign his or her name.
Origin
1920s; earliest use found in Printers' Ink.