Sinn and Bedeutung are usually translated, respectively, as sense and reference. Two different aspects of some terms' meanings, a term's reference is the object to which the term refers, while the term's sense is the way that the term refers to that object.
Sinn and Bedeutung were introduced by German philosopher and mathematician Gottlob Frege in his 1892 paper "Über Sinn und Bedeutung" ("On sense and reference"). Frege applied Bedeutung mainly to proper names and, in lesser extent, to sentences.
Though the distinction resides in philosophy of language, it enters philosophy's other areas, including philosophy of mind, metaphysics, and metaethics.
Read more about Sinn: Motivation For and Development of The Distinction, Sense Without Reference, Relation To Connotation and Denotation, See Also