The spiritual force of the !kung people of southern Africa.
It resides in all kinds of things, but in humans, it mostly resides in the gebesi. Num comes from the Gods, and is most evident in mind altering things and events -- especially the healing dances. To a much lesser extent, num is also present in alcohol and tobacco.
When brought to a 'boil' during a healing dance it can result in kia, and be used to pull out sickness.
More correctly called n/um, where the / stands for a dental click.