The lower-case letter Î³ {\displaystyle \gamma } is used as a symbol for: 1  Chromatic number of in graph theory. 2  Gamma radiation in nuclear physics. 3  The photon, the elementary particle of light and other electromagnetic radiation.  Surface energy in materials 1  science. The Lorentz factor in the theory of relativity.
The Social Hierarchy in Herds of Domestic and Wild Horses. Within the band there is a hierarchy with one mare co-leading the band. While the stallionâs role is to protect the harem from predators and other stallions; the dominant mare leads the band to shelter, food and water.
It is thought that Przewalski's horses have never been successfully domesticated. They live in two kinds of large, distinct social groups: harem and bachelor groups. Harems rarely have more than 10 mares and their offspring up to 2 or 3 years of age and are led by one dominant stallion.