A classic example of metonymy?
Metonymy - is a figure of speech in which a thing or concept is called not by its own name but rather by the name of something associated in meaning with that thing or concept.
The words “metonymy” and “metonym” come from the Greek: metonymía, “a change of name”, from metá, “after, beyond” and onymía, a suffix used to name figures of speech, from ónyma or ónoma, “name”.
For instance, “Wall Street” is often used metonymously to describe the U.S. financial and corporate sector, while “Hollywood” is used as a metonym for the U.S. film industry because of the fame and cultural identity of Hollywood, a district of the city of Los Angeles, California, as the historical center of film studios and film stars.[4] The national capital is often used to represent the government or monarchy of a country, such as “Washington” for United States government or “Downing Street” for the Government of the United Kingdom.
In addition to its use in everyday speech, metonymy is a figure of speech in some poetry and in much rhetoric. Greek and Latin scholars of rhetoric made significant contributions to the study of metonymy.
http://en.wikipedia.org/wiki/Metonymy