The letter N is the 14th letter of the English alphabet. It is believed to have developed from a snake hieroglyphic used by the Egyptians. Not long afterwards the Phoenicians adopted the letter into their alphabet. The Hebrews and the Greek followed suit. N represents the alveolar nasal sound in human speech. Only a handful of languages on earth lack this sound. It is the perfect letter to take to the Nth degree, obviously:
Nitroglycerin- a colorless, oily, explosive liquid.
Navratilova- Last name of a famous woman tennis player.
Nanotechnology- According to many the longest word starting with N.
Na Nu Na Nu- Alien greeting (Mork & Mindy TV series)
N in sign language