UCC Section 3-401: Signature is defined as something which may be made a) manually or by means of a device or machine, and b) by the use of any name, including a trade or assumed name, or by a word, mark, or symbol executed or adopted by a person with present intention to authenticate a writing.
As a side note: with the way some people sign their name, how would you know if the signature is the legal name or not?
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What we think, we become.
Buddha