# What is that indicator/math symbol?

1. Aug 11, 2017

### Arup Biswas

Some sort of hazziness inside a circle ..name of that??

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2. Aug 11, 2017

### Staff: Mentor

3. Aug 11, 2017

### Staff: Mentor

And it's only made to let English native speakers look bad, as it is no "th" but originally pronounced as "teta", and of course with an "eh", not an "e".

4. Aug 11, 2017

### Staff: Mentor

Err, what?

5. Aug 11, 2017

### George Jones

Staff Emeritus
It is an uppercase theta; you are probably mores used to seeing a lowercase theta.

6. Aug 11, 2017

### Staff: Mentor

Ancient Greek: θῆτα thē̂ta [tʰɛ̂ːta]

7. Aug 11, 2017

### Staff: Mentor

Oh, you're just saying it was originally pronounced differently than we do now.

8. Aug 11, 2017

### TeethWhitener

The Greek-Americans that I asked pronounce it "thita," rhyming with "pita" but enunciating the t.

9. Aug 11, 2017

### Arup Biswas

Isberg and Resnick really confuses me He could use beta,gamma or anything, instead of this uppercase theta

10. Aug 11, 2017

### Staff: Mentor

As this is in the context of radioactivity, alpha beta or gamma would be a problematic choice, and you probably want to keep delta for delta-electrons as well. $\theta$ for angles is quite common,no idea why that text uses $\Theta$.

11. Aug 11, 2017

### Staff: Mentor

Yes, but whether one pronounces it in modern Greek, with an "[ i ]" or in ancient Greek with an "[ e ]", the "th" is wrong, as it is the Greek version of a "t" which is pronounced as a "t". Perhaps I should start and say the Steelers are from Pittsborough ...
Edit: I might have been wrong here, as the Greek have a sound [$t^h$] which is closer to "th" than to "t", something as in "theft". I had forgotten that there is also the $\tau$ for "t".
Yes, but modern Greek is a bit different from the ancient language.

Last edited: Aug 11, 2017
12. Aug 11, 2017

### Staff: Mentor

We usually loot every alphabet we can get a hand on $a,b,c,\ldots , \alpha,\beta,\gamma,\ldots , \mathfrak{a},\mathfrak{g},\mathfrak{h},\ldots, \mathbb{C},\mathbb{F},\mathbb{N},\ldots ,\mathcal{A},\mathcal{B},\mathcal{C},\ldots , \mathscr{A},\mathscr{B},\mathscr{C}$
that it makes me wonder why we don't use и , я , ч , etc.

13. Aug 11, 2017

### Staff: Mentor

14. Aug 15, 2017

### Staff: Mentor

Don't forget the Hebrew letter aleph ($\aleph$), as in $\aleph_0, \aleph_1$ and so on.

15. Aug 17, 2017 at 4:00 PM

### Larry Boemler

Arabic has some interesting letters. Too many important symbols have a wide variety of meanings

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