Polycephaly is the condition of having more than one head. The term is derived from the Greek stems poly (Greek: "πολύ") meaning "many" and kephalē (Greek: "κεφαλή") meaning "head". A polycephalic organism may be thought of as one being with a supernumerary body part, or as two or more beings with a shared body. Two-headed animals (called bicephalic or dicephalic) and three-headed (tricephalic) animals are the only type of multi-headed creatures seen in the real world, and form by the same process as conjoined twins from monozygotic twin embryos.In humans, there are two forms of twinning that can lead to two heads being supported by a single torso. In dicephalus parapagus dipus, the two heads are side by side. In craniopagus parasiticus, the two heads are joined directly to each other, but only one head has a functional torso. Survival to adulthood is rare, but does occur in some forms of dicephalus parapagus dipus. There are many occurrences of multi-headed animals in  mythology. In heraldry and vexillology, the double-headed eagle is a common symbol, though no such animal is known to have ever existed. Occurrences
Two-headed people and animals, though rare, have long been known to exist and documented. Occurrence in humans
In humans, as in other animals, partial twinning can result in formation of two heads supported by a single torso. Two ways this can happen are dicephalus parapagus, where there are two heads side by side, and craniopagus parasiticus, where the heads are joined directly.
Kinneret is the Hebrew name of the Sea of Galilee, the largest freshwater lake in Israel. Other meanings of Kinneret and Kineret include:

Places
Camp Kinneret, a summer camp of Canadian Young Judaea
Kinneret (archaeological site), biblical city which gave the Sea of Galilee its Hebrew name; now Tell el-Oreimeh or Tel Kinrot on the northwestern coast of the lake
Kinneret College, college south of the Sea of Galilee
Kinneret Farm, experimental training farm (1908-1949), now museum
Kinneret Subdistrict, Israel
Kvutzat Kinneret, kibbutz southwest of the Sea of Galilee
Moshavat Kinneret, village (moshava) southwest of the Sea of Galilee

People
Kineret (singer), an Orthodox Jewish recording artist
Kinneret Shiryon (born 1955), Reform rabbi, the first female rabbi in Israel

Other
Kineret (medication), brand name of anakinra; no direct relation to the lake
Kinneret, Israeli song based on Rachel Bluwsteins poem "Perhaps" ("VeUlai")
Kinneret bream or Kinneret bleak, Acanthobrama terraesanctae, fish endemic to the Sea of Galilee and a second lake in Syria
Kinneret Zmora-Bitan Dvir, publishing company, Israel
Operation Kinneret, another name of the Israeli military Operation Olive Leaves

See also
All pages with titles containing Kinneret
All pages with titles containing Kineret