# Has anyone encountered the use of Omega to represent equilibrium?

One of my lecturers last year (a pharmacologist by training) used the symbol $$\Omega ^m$$ as a shorthand for equilibrium. He implied it was common practice but I've never come across it elsewhere. I was wondering if anyone else has encountered it?

• Interesting, what chemistry course was it, a pharmachem? Where exactly was the symbol used: above an arrow like $\ce{A <=>[$Ω^m$] B},$ or in the text and formulas as well? – andselisk Dec 24 '19 at 11:51
• Yes, it was a Chemical Pharmacology course. It wasn't used with equilibrium arrows, only in text. I've adopted it in all my notes to save me handwriting "equilibrium" every time. – atbm Dec 24 '19 at 12:08
• I think the instructor is mistaken. Can you find this notation in any textbook. I haven't seen this notation for equilibrium in my life. – M. Farooq Dec 24 '19 at 18:27

I would guess $$Ω^m$$ notation is a personal invention and I couldn't find any sources that would standardize it.
Uppercase letter "m" is probably because $$Ω^m$$ is a shortened form (contruction) of a single word that ends in the same letter: equilibrium.
$$\underset{Ω}{\underbrace{\text{equi}\underset{♎}{\underbrace{\text{libr}}}\text{iu}}}\underset{^m}{\underbrace{\text{m}}}$$