The trilon (or trylon?) and the perisphere were the central structures of the New York World's Fair of 1939-1940. The trilon was a 700-foot spire. Built in Flushing Meadows in Queens, New York, both structures were subsequently razed.

The trilon is mentioned in the Groucho Marx song Lydia the Tattooed Lady.

Don't confuse trilon with trillion.