sign / saɪn /
noun
a token; indication.
any object, action, event, pattern, etc., that conveys a meaning.
verb (used with object)
to affix a signature to:
to sign a letter.
to write as a signature:
to sign one’s name.
verb (used without object)
to write one’s signature, as a token of agreement, obligation, receipt, etc.:
to sign for a package.
to make a sign or signal:
He signed to her to go away.