Logblog: Richard Zach's Logic Blog
Carnap's Logical Syntax of Language actually deals with semantic notions such as "analytic." Why, then, didn't he call it "semantics"?
When the project was still in its early stages, Carnap sent a manuscript entitled "Metalogik" to Heinrich Behmann. Behmann objected to the title and suggested as alternatives first "Logic of Language" and then "Semantics." Carnap replied:
I like the term "semantics"; Gödel also suggested it. Neurath, on the other hand, thinks it is unappealing and pedantic; he suggests "syntax." In order to avoid confusion with syntax in philology, one would probably have to often call it "logical syntax."
Der Terminus "Semantik" sagt mir zu; auch Gödel schlug ihn gleichzeitig vor. Neurath aber findet ihn unsymphatisch und gelehrtenhaft; er schlägt "Syntax" vor. Zur Vermeidung der Verwechslung mit der philologischen S. müsste man dann wohl häufig "logische Syntax" sagen.
(Carnap to Behmann, April 17, 1932)