5-Element Classes
These are 5 Tanmaatra, 5 Mahaa Bhoot, 5 Gyaan Indriyaan, 5 Karm Indriyaan and their 5 Devtaa for both types of Indriya. These six groups are indicated here as 5-Element classes.

Aashram
There are three meanings of Aashram:
1 - Aashram means hermitage. Here sages live along with other sages. They build their huts, small or large, and do their daily chores of Tap, worship, Yagya etc. When somebody goes to Van, since he is not supposed to live in bricks houses, he builds a Kutiyaa (made of leaves, twigs, straws, trees, trees' branches etc) for himself to live and to do his worship etc. When several people live nearby in such Kutiyaa, that is also called Aashram.

2 - That place was also called Aashram where disciples used to go to get educated. This is the place where they used to spend their "Brahmcharya" period of their lives. (see No 3 meaning). It was also called Gurukul. Thus Guru, his wife and disciples were considered as a family where Guru and his wife were like parents of the disciple. Guru's wife use to make arrangements for disciples' food etc and was usually called Guru Maataa (mother). They used to live in huts, work for Aashram, get alms, and learn.

3 - Its another meaning is life's four stages of human life. In Hindu Dharm a person lives his life under four Aashram - Brahmcharya Aashram, Grihasth Aashram, Vaanprasth Aashram, Sanyaas Aashram. A person's age is supposed to be 100 years and each Aashram span is about 25 years of age.

(A) - Brahmcharya Aashram. The first 25 years have been assigned for study. And this period is called Brahmcharya Aashram. During this period one is supposed to sleep on floor, to eat minimum and whatever is available food, to observe celibacy, to serve Guru (teacher), and to acquire knowledge. 
(B) - Grihasth Aashram. The second 25 years (26-50) have been assigned for Grihasth Aashram. In this period a person marries, has children and fulfills all his duties towards God (Yagya, charity, alms, fasts etc). Grihasth Aashram has been considered the most important period of the life as it is the only period when a man can repay his all Rin (loans - Brahm Rin, Dev Rin, Pitra Rin) by producing children, imparting knowledge, and doing Yagya and other religious duties. 
(C) - Vaanprasth Aashram. The third part, the next 25 years (51-75), are assigned to Vaanprasth Aashram. In this Aashram, a person may live in the house or in forest but detaches himself from materialism and prepares himself for Sanyaas. 
(D) - Sanyaas Aashram. The fourth and last 25 years are assigned to Sanyaas Aashram. In this one a person is supposed to leave the world, all kinds of worldly pleasures, all materialism and all worldly involvement and spend his time in all kinds of spiritual activities, keeping minimum things with him, eating only whatever he gets in alms etc.

Barhishmatee Nagaree
When Varaah Bhagawaan was bringing the Prithvi up from Rasaatal, His furs fell at this place. After that the place was called Barhishmatee Nagaree. The same fur were converted into evergreen Kush and Kaas. When Manu got this Nagaree to live, he worshipped Shree Hari on the Aasan of this Kush and Kaas. The great king Sahstraarjun was also the king of this place.

Beyond Tri-Lok
Four Lok - from Mahar Lok, Tapah Lok, Janah Lok to Brahm Lok (Satya Lok)
Brahmaa Jee's 1 Day   =  1,000 4-Yug Period 
                                 = 1,000 x 4,320,000 (4-Yug years) = 4,320 million Human Years
Brahmaa Jee's 1 Night =  1,000 4-Yug Period  (Brahmaa Jee sleeps in this period)
Brahmaa Jee's one day and night = 2,000 4-Yug period = 8,640 million human years

Four Yug
Sat Yug          = 4,800 Divine years  (includes 800 Sandhyaa and Sandhyaansh)
Tretaa Yug     = 3,600 Divine years (includes 600 Sandhyaa and Sandhyaansh)
Dwaapar Yug  = 2,400 Divine years (includes 400 Sandhyaa and Sandhyaansh)
Kali Yug         = 1,200 Divine years (includes 200 Sandhyaa and Sandhyaansh)
------------------------------------------------------------------
  Total           = 12,000 Divine years
------------------------------------------------------------------

1 Devtaa (Divine) day and night  = One human-year   
Thus One Devtaa year              = 360 Human-years
Thus    Kali Yug                        = (1,200 x 360)    432,000 Human-years 
           Dwaapar Yug                = (2,400 x 360)    864,000 Human-years 
           Tretaa Yug                   = (3,600 x 360)  1,296,000 Human-years 
           Sat Yug                       = (4,800 x 360)  1,728,000 Human-years )
   4-Yug or Mahaa-Yug             = 4,320,000 Human Years (12,000 x 360)

these four Yug continue up to 12,000 Devtaa Years
           Kalp               = starts at the end of Brahmaa's night and continues 
                                   till Brahmaa Jee's day ends. (4,320 million human years)
          1 Kalp              =  Brahmaa Jee's Day only (14 Manu, 14 Manvantar, 4,320 million years)
          1 Manu rules     = 1000 4-Yug period / 14 = 71  4-Yug Period plus

Kaay
"ka" is the name of Brahmaa Jee and since this body was divided from his, this body is called "Kaayaa" (Shareer, body) 

Naadikaa
Make a pot of 6 Pal copper, which can hold 1 Prasth water. Make a golden rod of 4-finger length weighed 4 Maashaa and make the hole from that needle in that pot. Drop that pot in water. Whatever time it will take to fill that pot with water and sink in the water is called one Naadikaa time.

Rin (debt)
Thre are three types of Rin - (1) Dev Rin - this is given to Devtaa by doing Yagya, (2) Pitra Rin or Brahm Rin - this is given to Pitaa (father) or Brahmaa by helping continuing his Vansh (family line) by producing a son, (3) Rishi Rin - this is given to Rishi by studying.
[page 3/14, 10/u29]

Ritwij
Ritwij are the four priests - Hotaa, Udgaataa, Brahmaa and Adhwaryu, who perform religious duties and their functions are ascertained by Brahmaa Jee himself.

Sarp and Naag
Naag are different from Sarp (snakes) as they have a very broad head.

Seven Swar
Shadaj, Rishabh, Gandhaar, Madhyam, Pancham, Dhaivat, Nishaad. These are the seven Swar (sounds or notes) in Indian music.

Shesh's Complexion
Vishnu Puraan 5/-- says that his complexion is as white as ivory. Since Lakshman and Balraam were his incarnations and since both were of fair complexion, it seems true that he should be of fair complexion.