A CNN article about the Al-Jazeera report on Al Qaeda codenames:

] "About three weeks before September 11, targets were
] assigned to four teams, with three of them bearing a code
] name: The U.S. Capitol was called "The Faculty of Law;"
] the Pentagon became "The Faculty of Fine Arts;" and the
] North Tower of the World Trade Center was code-named by
] Atta as "The Faculty of Town Planning."
]
] One of the terrorists, Abu Abdul Rahman, pretended to
] send a love message via an Internet chat room to his
] German girlfriend, who was actually Binalshibh. It
] contained more code for the attacks:
]
] "The first semester commences in three weeks. Two high
] schools and two universities. ... This summer will surely
] be hot ...19 [the eventual number of hijackers]
] certificates for private education and four exams.
] Regards to the professor. Goodbye."

Al-Jazeera Accounts of 9/11 Planning