Ashta Dikpalakas (Dikpalas) :
Ashta Dikpalas are the guardians of direction. There are eight deities who are responsible for protecting the eight directions of the world, they are known as Ashta Dikpalakas. They are:
Kubera : for North (Uttara)
Yama : for South (Dakshina)
Indra : for East (Pūrva)
Varuna : for West (Paścima)
Isana (Shiva) : for North-East (Īśānya)
Agni : South-East (Āgneya)
Vayu : North-West (Vāyavya)
Nirrti (sometimes Raksasa) : South-West (Nairṛti)
In addition to these there are two more deities added for extra dicrections and then the Dikpalakas are considered as being 10 or Dasa-Dikpalakas, being
Brahma : Zenith (Ūrdhva)
Vishnu : Nadir (Adho)
The Ūrdhva and Adho are also considered, but not so prominent, because the major use of the Dikpalakas as enlisted in the Vastu-Shastra which observes only the eight major directions.
The Vastu-Shahstra on relation with the eight direction, defines the eating,sleeping, reading and worshiping habbits, a common e.g. is not to sleep with your legs facing the South(Dakshina) direction.
The Dikpalas are also considered as Lokpalas when considered as the guardian of universe directions.