|Reference, in philosophy: relation of a linguistic expression or action to a real object. Reference presupposes the existence of this object. An expression, which corresponds to no object, has no reference, however, may have a meaning. See also unicorn, Pegasus.|
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When sense was the same as meaning (reference), a sentence could not tell anything what a person who knows the name does not already know.
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Dum III 113
Reference/Singular term/Frege: in truth theories of Frege s type all singular terms have a guaranteed reference, always a reference object! - So are sentences with "Unicorn": not wrong but without truth value - RussellVs: sentences with "unicorn" are always wrong.
Die Grundlagen der Arithmetik Stuttgart 1987
Funktion, Begriff, Bedeutung Göttingen 1994
Logische Untersuchungen Göttingen 1993