Diagram of the cosmology represented by the Slavic four-headed scupulture Sviatovid ("Worldseer", "Worldseeker"). In some traditions, the white northward head is Svarog himself, the red westward head is Perun, the black southward head is Lada, and the green eastward head is Mokosh, thus two are male and two female. In other traditions, the eastward head is Ruevit (Rugievit), the southward head is Porevit (Porovit), the westward head is Gerovit (Jarovit), and the northward head is Svarog himself. They represent the four directions of space, the four seasons of time, and the four Russias of sacred geography. Sviatovid has been described as the complete representation of the axis mundi, symbolising the union of the four directions of space and the three dimensions of reality (Heaven, earth and the netherworld).
Sources:

Dynda, Jiří (2014). "The Three-Headed One at the Crossroad: A Comparative Study of the Slavic God Triglav" (archive). Studia mythologica Slavica. 17. Institute of Slovenian Ethnology. pp. 57–82. ISSN 1408-6271.
Leeming, David (2005). The Oxford Companion to World Mythology. Sydney: Oxford University Press. ISBN 9780190288884. pp. 359–360.
Entry about the scupulture in the Ukrainian Soviet Encyclopedic Dictionary, 1987.
Own work
Eckhardt Etheling