All Information about Yama
Image reference for Yama in Various Concepts

Yama as Yamraj
According to Hindu Concepts and Rigveda Deities, Yamraj is called the deity of Death and Justice.
As you already know, Patanjali used the word Yama as "stop" or "Control", Yama word is taken from
Rigveda because Yamraj is one who stops our life as death. We are here on earth not to enjoy but for
a mission. If we would be here just for enjoyment, God could offer us paradise for that but
unfortunately, we have forgotten our main mission and objective.
Yamraj waits for the right time according to the justice of Karma and takes away the Panch Prana (5
Prana) step by step which is the process of death.
If you do not know about Karma Concept, please
read this blog for understanding the rules of Karma:
Click
to read: What is Karma? - Blog
Yamraj is the son of God Surya (the sun). Same to Sun, Mars, and Saturn, Yamraj is also a destroyer.
According to the Vedas, Yama is the first mortal who
died. Although Shiva comes first as AdiYogi (The first Yogi) but Shiva is immortal that's why Yamraj
showed the demonstration fo death to the creator Lord Brahma.

Yama as Control (5 types of Yama)
Yama is not an automatic stoppage. If you are in a yogic practice, doing some amazing daily
schedule, it will not stop any kind of Vritti or habits until you take an oath or Vow. Yama is a
serious matter and a very hard step of Yoga. It's like if you have to wake up at 4 am and go to the
roof, the very first step is very hard to do. All the illusions (Maya) will stop you to do such a
great work of early morning wake up and force you to sleep more. After the first step. it is not as
hard as other steps.
Yama has 5 steps to follow:
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Ahinsa (non-violence)
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Satya (truthfulness)
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Asteya (non-stealing)
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Brahmacharya (Balance of the energy)
-
Aparigraha (non-greed)

Yama as Dharmapala
The word Dharma means Responsibility or Justice and Pala means who nourishes or take responsibility.
Yama is called Dharmapala because when the human finishes all the duties on earth, it is justified
to stop his life. Even if, the human is doing great karma, Dharmapala may give him death to stop his
good karma also, because good karma is storage that will make a destiny. While enjoying the good
karma as destiny, the human may do mistakes again as bad Karma.
Click
to read: What is Karma? - Blog

Yama as Yamloka
Yamlok simply means the place of Yama. Yamaloka is the first destination after death. Yamaloka is the place where an accountant is having all the tally of your good karma and bad karma and shows it after death to the dead person.

Yama as Devas in Buddhism
In Buddhist Cosmology, there are Devas as Gods and Asuras as demons.
Buddhism has Major Devas as follows:
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Brahma: the supreme deva, who requested Buddha to teach
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Indra: a major deva
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Prajña: goddess of knowledge. Buddha’s mother was considered an incarnation.
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Mara: a deva associated with death and hindrances to enlightenment. It was Mara who tempted Buddha under the bodhi tree.
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Yama: the king of the 21 hells (see image above).
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Nagas: great serpents (or dragons, or water creatures). The king of the Nagas protected Buddha from a storm.
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Gandharvas: angelic beings who provide the gods with music
Click to read: Buddhist Cosmology by Dr. C. George Boeree, Shippensburg University

Yama as Muhurta Kaal (Period of Time)
The word Muhurta Means "Division of Time". Every day we have some auspicious times and unfortunate
or Inauspicious times also.
There are 30 Muhurta (period/divisions of time) as follows:
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Rudra (रुद्र)
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Aahi (आहि)
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Mitr (मित्र)
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Pitr (पितॄ)
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Vasu (वसु)
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Varah (वाराह)
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Vishwedeva (विश्वेदेवा)
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Vidhi (विधि)
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Satmukhi (सतमुखी)
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Puruhut (पुरुहूत)
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Vahini (वाहिनी)
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Naknkara (नक्तनकरा)
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Varuna (वरुण)
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Aryaman (अर्यमन्)
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Aryaman (भग)
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Girish (गिरीश)
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Ajpad (अजपाद)
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Ahir Badhnya (अहिर्बुध्न्य)
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Pushya (पुष्य)
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Ashvini (अश्विनी)
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Yama (यम)
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Agni (अग्नि)
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Vidhātṛ (विधातृ)
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Kaṇḍa (क्ण्ड)
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Aditi (अदिति)
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Jīva/Amṛta (जीव/अमृत)
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Viṣṇu (विष्णु)
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Dyumadgadyuti (द्युमद्गद्युति)
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Brahma (ब्रह्म)
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Samudra (समुद्र)

Yama as Planet Pluto
Pluto is also called Yama in ancient Indian stories. When Pluto or Yama enters the chart of Vedic Astrology of someone, it is considered as death. Pluto does not interfere with the Navagraha's Roles but when it appears in the Kundali (Birth Chart), the person may die in that time period.
9 Vedic Planets (Navagraha) are as follows:
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Sun (Surya)
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Moon (Chandra)
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Mars (Mangala)
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Mercury (Budha)
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Jupiter (Brihaspati)
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Venus (Shukra)
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Saturn (Shani)
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Rahu (north node of the moon)
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Ketu (south node of the moon)
Click to read: About Navagraha