The seven chakras have an especially important role in yoga, Ayurveda, and Jyotish.

​They are energy centers on which we can depend for the integration of the physical, psychical, and astral bodies.

Here is a purported connection of the seven chakras to neve plexi

​In Vedic numerology what we are really talking about are the symbols of number with their equivalencies in graha (the Sun, Moon, nodes of the Moon, and planets) and symbols of space as relevant segments of the zodiacal belt.

Just as there is a language to numbers, namely mathematics, there is a corresponding language of space-time through the moving graha, namely Jyotish.
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The Vedic assignations of number and graha are as follows:
1 is the Sun & the sign of Aries,
2 is the Moon & the sign of Taurus,
3 is Jupiter & the sign of Gemini,
4 is Rahu & the sign of Cancer,
5 is Mercury & the sign of Leo,
6 is Venus & the sign of Virgo,
7 is Ketu & the sign of Libra,
8 is Saturn & the sign of Scorpio,
9 is Mars & the sign of Sagittarius.
The reasonings for the associations that I have come up with are below.
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1 is the Sun & the sign of Aries

​This association is an easy at-bat. The Sun is exalted in Aries. This makes sense as the Sun is the king (among other significations, but this article will try to keep things simple), and Aries is the battlefield (same). The king’s highest moment is on the battlefield. Besides exaltation, it also makes sense to look at the lordship of the Sun. That is Leo, here in the fifth house.

For the Sun’s own sign to be in the fifth house is especially proper as that house indicates the beating heart, the liver, and other physical indications of the Sun.
So, the nomenclature for this article is to name the exaltation house and lordship house(s) in the following way: E1:L5. The utility of this will hopefully be clearer as time goes on, and a summation will be in the final paragraph.

2 is the Moon & the sign of Taurus