indorsement

nouns

a promotional statement (as found on the dust jackets of books)
"the author got all his friends to write blurbs for his book"
is derived from
a speech seconding a motion
"do I hear a second?"
is derived from
formal and explicit approval
"a Democrat usually gets the union's endorsement"
is derived from
a signature that validates something
"the cashier would not cash the check without an endorsement"
is derived from
the act of endorsing
"a star athlete can make a lot of money from endorsements"
is derived from