One who signals. / A device that sends a signal.

(British spelling) One who signals. / (rail transport) synonym of signalman

A courtesy title for a man of Italian origin.

(transitive, archaic) To distinguish, to make noteworthy. / (transitive, archaic) To display or make known (an attribute, quality, etc.); to call attention to.

An isotopic signature

(physics, chemistry) A set of ratios of the abundances of different isotopes of specified elements in a sample, used as a diagnostic test of the sample's origin, or of its age

(music, broadcasting) The tune that opens and/or closes a radio or television programme.

(mathematics) Synonym of significant figure

An indication that something is a paraphrase or direct quote. / A phrase that signals a particular meaning or stance.

plural of signal phrase