I'm writing my final work of the career, but I can't find how to write this symbol.

enter image description here

It's like a weird "a" before (θ, ϕ).

Thank you so much!

  • 2
    Have a look at “How to look up a symbol?” for ideas how you can easily find a particular symbol.
    – dexteritas
    Jul 6 '17 at 11:03
  • 1
    Welcome to TeX.SX! It's not a weird symbol: it's an “A” in a calligraphic font. Use \mathcal{A} and you'll be OK even if the shape is different.
    – egreg
    Jul 6 '17 at 11:03
  • 4
    It would be much more helpful to your career if you skip such arcane notation in my humble opinion.
    – percusse
    Jul 6 '17 at 12:44
  • 3
    Looks also a little like \mathcal{a} from mtpro2, but that's a commercial font. (i.e. not free)
    – Troy
    Jul 6 '17 at 13:28
  • 1
    i.imgur.com/JkJwK7x.gif Feb 20 '19 at 10:08

The closest I could find is TypoUprightBT:

    \newfontfamily{\uprightcal}{TypoUpright BT}


    \[ \text{\uprightcal{A}}\mkern1mu(\theta, \phi) \]


Example of the font

  • In unicode-math, you can either \setmathfont[range=cal]{TypoUpright BT} and use it as \mathcal{A} or \setmathfontface\uprightcal{TypoUpright BT} and use \uprightcal{A} (which no longer requires \text).
    – Davislor
    Feb 23 '19 at 1:41

The A of your image might seem the same of full mt2pro package:

enter image description here


I think the letter has been retouched to get bold with an external program that uses TrueType fonts. In the image you can see that in the character map there is the bold font (MT2MCS):

enter image description here

  • From where you got mtpro2?
    – Sigur
    Feb 20 '19 at 21:17
  • @Sigur From the guide https://pctex.com/files/managed/1/1b/mtpro2Abbrev.pdf pag. 7.
    – Sebastiano
    Feb 20 '19 at 21:25

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