2
$\begingroup$

I've been working on a programming project involving Peter Duffett-Smith's Practical Astronomy With Your Calculator (3rd Ed.), which has a large number of mathematical/astronomical formulas in it. There's a part at the end of the book for symbols and abbreviations, which contains this:

enter image description here

After doing some Google-fu, I was unable to find the name of the symbol. Would anyone smarter than me (which should be quite a few of you... heck, quite a lot) know what this is? Hopefully there's Unicode for it...

$\endgroup$
1
2
$\begingroup$

This is a variant of pi, or "pomega".

In LaTeX, you can get it by using

                                          \varpi

$$\varpi$$

TeX has a question on the 'var' prefix, and Wikibooks has something relevant.

The various forms of pi are present in Unicode as:

  • U+03A0 Π greek capital letter pi (HTML Π · Π)
  • U+03C0 π greek small letter pi (HTML π · π)
  • U+03D6 ϖ greek pi symbol (HTML ϖ · ϖ)
  • U+220F ∏ n-ary product (HTML ∏ · ∏)
  • U+1D28 ᴨ greek letter small capital pi (HTML ᴨ)
  • U+1D70B 𝜋 mathematical italic small pi (HTML 𝜋)
  • U+1D6D1 𝛑 mathematical bold small pi (HTML 𝛑).

It is used to denote the longitude of the periapsis, as in your case.

$\endgroup$

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.