Sanskrit #mṛgaśiraṣa (popularly spelled Mārgaśīrṣa/ #Mṛgaśira) (Devanagari: मृगशीर्ष) (Tamil: மிருகசீரிடம்) (Sinhalese: Muwasirasa) (Kannada: ಮೃಗಶಿರ) the 5th #nakshatra or lunar mansion as used in Hindu astronomy and astrology is the constellation Orion. The term Mṛgaśira (मृगशिर) a composite of two Sanskrit words, mṛga (मृग) meaning animal/beast and śira (शिर) meaning head or precisely, the top of the head. Thus Mṛgaśira (मृगशिर) is the correct name of the star, while Mārgaśīrṣa (मार्गशीर्ष) is the name of the month related to Mṛgaśira, i.e., the month in which moon will be in conjuncture with the Mṛgaśira nakshatra. In Malayalam it is called Makayeeram.

Mahabharata (Vana.221.15) tells us that #Soma’s brother is #Agni, and his sister is #Rohini. The two brothers, Soma and Agni stand on both sides of their sister. To one side of Rohini is Soma’s star, Mṛgaśīrṣā. To the other side is Agni’s star, #Krittika.

B G Tilak in his ‘Orion and antiquity of Vedas’ mentions on Bhagvad Gita with Lord Krishna saying: ‘Among Nakshatras I am Mrigashirsha’ (Among the asterisms on ecliptic, I am the #Orion). In Vedic thought the two stars Rohini and Mrigashirsha are thought to be the most sacred region in space and are described as the head of Prajapati.

In Vedic tradition, soma (Sanskrit: सोम) is a ritual drink] of importance among the early #Vedic Indians. In both the #ancient religions of Historical Vedic religion and Zoroastrianism, the name of the drink and the plant are the same. The Rigveda mentions it particularly in the Soma Mandala. Several section of Ṛig Veda (9) is dedicated to Soma as giver of immortality (Amrita). Rig Veda 9.42 goes refers Soma the “immortality of the immortals” and the “godhood within the gods.” Elixir made from the Soma plant is known for giving legendary power for several Rig Vedic Gods to fight against evils.
https://www.farfaraway.co/blog/mrigasira-nakshatra-characteristics