In eastern philosophy there is a concept of chakras. The most common
version I have seen is from yoga with 7 chakras([चक्र,
Sanskrit: round/circle/disc/wheel) or padmas(Sanskrit:
lotuses)]{lang="sa" lang="sa"}, but apparently a similar concept exists
in Bön with 6 realms of experience, and in some Chinese philosophy
with 3 kettles, or dantien(丹田).

A chakra is an energy center along the spine (or above). In addition to
the chakra, there are also some energy channels nadis(yoga),
meridians(qi-gong). The chakras of the yogi tradition are the following
places on the body

  • Mūlādhāra – root / spine base
  • Svādhiṣṭhāna – sacrum
  • Maṇipūraka – solar plexus / navel
  • Anāhata – heart
  • Viśuddha – throat
  • Ājñā – the third eye
  • Sahasrāra – crown

I was a bit confused about the actual number, as the work that describes
the chakras is called, Ṣat-cakra-nurūpana, “Description of the six
chakras” (which I have not read yet), – but that is probably because the
seventh is special.

The Sanskrit word “chakra”, comes from Proto-indo-European “*kʷékʷlos”,
which also descended into “*hwehwlą” in Germanic, which is quite
similar to “wheel”, or Old Norse “hvél”(singular, plural: “hjól”) which
is just “hjul” in Danish. All of which mean wheel.

When entering sanskrit transliteration on linux, set up with an
english-mac-keyboard-layout, overbar can be composed with meta+shift+”,”
followed by the letter, fōō, and underdot can be composed with
meta+shift+”h”, ḅạṛ. The other accents are just meta+”n”, meta+”e”, and
meta+shift+”x”. Had to copy/paste “ʷ”.

Disclaimer: I am no expert on this topic, and write as a way of
learning. it is also outside of my somewhat tradition western scientific
view of the world, but interesting nonetheless.