In James Munkres' classic topology textbook, he writes a topology T using a typeface I am unfamiliar with.
I tried looking it up using detexify and checking commonly used character sets but the closest I could find was a capital fraktur I.

In James Munkres' classic topology textbook, he writes a topology T using a typeface I am unfamiliar with.
I tried looking it up using detexify and checking commonly used character sets but the closest I could find was a capital fraktur I.

\mathcalor some script T. – Johannes_B Mar 19 '15 at 09:03eulervm. – Johannes_B Mar 19 '15 at 09:08