Varuna and Vritra : In vedic literature as well as Indus script, word Varuna and Vritra are derived from the same root - to cover. Both are the transformations of one super power. One is the cover of light, the other of darkness. One is fire, the other is stone. For world manifestation, both are equally important. Hence, even though Indra kills Vritra, still he keeps him alive in benign and demonic forms and uses them. If Varuna gives heat and light in the outer world, Vritra also exists as the fire of stomach. In Indus seals, Vritra has been depicted in a form who has left enmity with gods. Instead, he has become their friend. 

For example, the buffalo bull, which has been shown as creating destruction and itself being targeted by a spear, at some places has been shown in the form that a vessel type thing is kept before it and it is quite sober, and the last letter of the script above it is ma(creative). Highest type of creation can be through Yagna, and if Vritra also contributes in it, then in Indus culture, he is called Vritrajashna or Vritra Vashat. On the other hand, even the symbols for Varuna, who is a godly figure, if Yagna - opposing traits are introduced in him, then these are considered as enemies of Omkara or Yagna. 

For example, there is seal where a Um has been depicted as running out of a he - goat, and there is a small u above the head of this he - goat. This seals bears word Vritra, and this word bears word an written three times with three types of a's. It means that this he - goat represents a person who has acquired Vritrahood at three levels of three types of a's.

There is a significant symbolism in Indus valley seals that the mouth of animal is turned right or left depending on whether godliness(Varuna) or devilness(Vritra) has to be depicted in the quality of the animal. This rule is followed to such an extent that if for some reason the animal is going towards right, his mouth will essentially be turned to the left to depict demonical character. There is a seal where a tiger tries to steal ana and anna from the human body, while the presiding soul protects this ana and anna and ultimately this tiger has to bend and this seal bears words indicating this meaning. There is another seal where this tiger becomes totally calm after coming near the letter pa of super power, and becomes right - mouth.

There is a significant symbolism in Indus valley seals that the mouth of animal is turned right or left depending on whether godliness(Varuna) or devilness(Vritra) has to be depicted in the quality of the animal. This rule is followed to such an extent that if for some reason the animal is going towards right, his mouth will essentially be turned to the left to depict demonical character. There is a seal where a tiger tries to steal ana and anna from the human body, while the presiding soul protects this ana and anna and ultimately this tiger has to bend and this seal bears words indicating this meaning. There is another seal where this tiger becomes totally calm after coming near the letter pa of super power, and becomes right - mouth.

Another symbol of demonical nature is buffalo - bull which is destructive when it's mouth is turned towards left. When it's mouth is turned towards right, a v - type vessel is situated before it, which is symbolic of benign god Varuna.

There are two types of Swastikas on Indus seals - clockwise and anticlockwise. One seal contains 4 anticlockwise and 5 clockwise swastikas. Alongwith clockwise Swastikas, there is some inscription and a man is presenting letter pa to a left - mouth tiger. The inscription bears words Vritra Anaanna aaa(muskmellon type). This indicates that Vritra has covered  five levels of the human body, and by presenting a pa to it, efforts are being made to divert it towards five clockwise Swastikas, towards godliness of Varuna. 

http://www.harappa.com/script/indusscript.pdf

The question is which one is that centre about which one has to turn left or right? The answer to this question lies in the sign cross. Some scholars feel that cross sign came from outside the Indus culture, because this has not been found as much as the Swastika. Whatever may be the case, Swastika is formed by making the cross clockwise or anticlockwise. It seems wise that cross  signifies that central state of individuality which can turn to darkness of Vritra by moving anticlockwise and to light of lord Varuna by moving clockwise. Clockwise Swastika is symbol of Varuna while anticlockwise Swastika is symbol of Vritra. But what is in between? The answer is  - the cross, the letter ka of the indus valley. The cross of Indus culture is sometimes surrounded by ma, symbolic of mind. Inside this ma, there are four na at the four corners. At other places, there are four bands of cross lines. Out of these, two vertical bands may be taken to mean the inward and outward tendencies, while the horizontal bands may be taken to mean the left and right tendencies of Vritra and Varuna. When human mind is free from these two types of tendencies, only then it is depicted by a pure cross or by a flying eagle. Hence, on one side of a seal there is a cross, while on the other side there is flying eagle. The same fact is depicted on the seal of a yogi who bears a Pranava on a Vashat on his head and there is depicted a flying eagle also. Eagle symbolizes freedom from five bondages of Vritra.

When the Vritra part becomes dominant in an individuality, then mind becomes absent. In this case, the head of the animal becomes absent in Indus seals. This has been named as Vritra Makha in the seals. 

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