In this equation, to the left of the equals sign, just after the delta. Does it have a name or a unicode number? I’ve never seen it before.
I have no idea. What’s the context? I’m guessing that that’s from a scan of an old journal paper.
The equation also looks odd in that there are some really obvious simplifications on the right side, such that I’m not sure why it would be written that way.
when I first saw the symbol, it looked like a pi symbol in some fancy font.
Not sure though. But that is my guess.
It’s from the Feynman Lectures. It’s the number of modes of photons or EM waves in a box.
That is Y from the Fraktur font - maybe represented as gamma.
I have seen it used in old texbooks for engineers
It’s “N” in a font called Fraktur. I have no idea what it means.
I believe it is a script N, i.e. the letter N in a fancy script font. Script letters show up from time to time in physics equations and N is sometimes used for the density of states, as in this case.
Thanks.
No, it’s an “N” in Fraktur, an oldstyle German font. Fraktur is not a script typeface.
Thanks. I didn’t realize that it was Fraktur. It was always called “script N” when I encountered it in physics classes. I will note, however, that, when I took high-school German in the USA, Fraktur was called “German Script.”
Isn’t math great? If you don’t already know what something means there is no way to figure it out.
The OP knew what it meant. He’s just asking the name of the glyph.