SOS [pictured]
Rory asks to set up an SOS signal with Lorelai in case she needs to leave Sherry’s early. Lorelai decides the SOS signal will be … SOS. Makes sense.
SOS is an international distress signal, made of the Morse code signals for the letters – three dots, three dashes, three dots, as a signal that is both distinctive and easy to remember. In official international use since 1906, it has popularly been imagined as standing for “Save Our Souls” or “Save Our Ship”, and in general use, indicates a crisis or need for action.
Flare
Lorelai says that any time Rory wants to leave, to send up a flare.
A flare is a type of pyrotechnic that produces a bright light without an explosion. They can be used as a distress signal.
“Sign it”
Lorelai refers to several different ways she could say that Rory is going to Harvard. One of them is signing, by which she means American Sign Language, the sign language for the deaf used in North America.
Mime
Another way Lorelai could communicate. Miming means to act out a story using only the body motions, without speech. Mime as a theatrical performance has been used since ancient times.
Morse Code
Another way Lorelai could communicate. Morse code is a method used in telecommunication to encode text characters as standardised sequences of two different signal durations, called dots and dashes. Morse code is named after Samuel Morse, one of the inventors of the telegraph.
Interpretative Dance
Another way Lorelai could communicate. Previously discussed.
The Annotated Gilmore Girls 