Princeton University

For other Princetons, see Princeton. Most of them are named after the University.

Old Nassau

This phrase can refer to:

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• Old Nassau, Princeton's alma mater since 1859, with words by then-freshman Harlan Page Peck and music by Karl A. Langlotz. The text of Old Nassau is available from Wikisource.
• Nassau Hall, to which the song refers, built in 1756 and named after William III of England, of the House of Orange-Nassau. When built, it was the largest college building in North America. It served briefly as the capitol of the United States when the Continental Congress convened there in the summer of 1783.
• By metonymy, Princeton University as a whole.
• A chemical reaction, an example of a "clock reaction", dubbed "Old Nassau" because the solution turns first orange and then black, the Princeton colors. It is also known as the "Hallowe'en reaction".