NaK, or sodium-potassium alloy (commonly pronounced 'knack'), is an alloy of potassium (K) and sodium (Na) which is usually liquid at room temperature. Various commercial grades are available. NaK is highly reactive with water and may catch fire when exposed to air, so must be handled with special precautions.
NAK is the negative-acknowledge character used in computers and telecommunications.
NAK or Nak may also refer to:
- Nak, a female yak
- Nak, Hungary, a village in Tolna County, Hungary
- NaK, an alloy of sodium and potassium
- NAK (protocol message), a computer communication protocol message
Mae Nak Phra Khanong, a ghost of Thai folklore
- Nak (film), an animated film based on the Thai ghost
- Ningalkkum Aakaam Kodeeshwaran, a quiz show in Malayalam based on Who Wants To Be A Millionaire?
Nak is a Thai animated fantasy film that was released on April 3, 2008.
The story is based on ghosts of the folklore of Thailand, who in this movie shed their sinister reputation and are the heroes. Nak, its central character, is based on the figure of Mae Nak, a Thai female spirit that has a baby and can stretch her arms. Nak's striking fuchsia-colored hair and eyes in this movie are a departure from her alleged looks in traditional lore though. Other spirits familiar to Thai people that appear in this movie are Phi Hua Kat, Krahang, Krasue, Phi Am, Nang Tani, Nang Takian and Phi Phong.
Ghosts from other backgrounds such as Phi Yipun, the scary woman with long, stringy black hair wearing a white gown, a well-known vengeful ghost ( onryō) from Japanese horror films based on the Yotsuya Kaidan story, also have a role in the Nak movie.