In Ancient Egyptian religion, Tefnut, transliterated tfnt (tefenet) is a goddess of moisture

Moisture

Humidity is the amount of moisture the air can hold before it rains. Moisture refers to the presence of a liquid, especially water, often in trace amounts...

, moist air, dew

Dew

[Image:Dew on a flower.jpg|right|220px|thumb|Some dew on an iris in Sequoia National Park]]Dew is water in the form of droplets that appears on thin, exposed objects in the morning or evening...

 and rain

Rain

Rain is liquid precipitation, as opposed to non-liquid kinds of precipitation such as snow, hail and sleet. Rain requires the presence of a thick layer of the atmosphere to have temperatures above the melting point of water near and above the Earth's surface...

. She is the sister and consort of the air god Shu

Shu (Egyptian deity)

In Egyptian mythology, Shu is one of the primordial gods, a personification of air, one of the Ennead of Heliopolis. He was created by Atum, his father and Iusaaset, his mother in the city of Heliopolis. With his sister, Tefnut , he was the father of Nut and Geb...

 and the mother of Geb

Geb

Geb was the Egyptian god of the Earth and a member of the Ennead of Heliopolis. It was believed in ancient Egypt that Geb's laughter was earthquakes and that he allowed crops to grow. The name was pronounced as such from the Greek period onward,...

 and Nut

Nut (goddess)

In the Ennead of Egyptian mythology, Nut was the goddess of the sky.-Goddess of the sky:...

.
Literally translating as "That Water", the name Tefnut has been linked to the verb 'tfn' meaning 'to spit' and versions of the creation myth say that Atum spat her out and her name was written as a mouth spitting in late texts.

Unlike most Egyptian deities, including her brother, Tefnut has no single ideograph or symbol.