How can I get \tau to be like the real number symbol \Re similar to the ones in the attached photo.


  • 2
    Why is this tagged as latex3?
    – user31729
    Jun 2, 2017 at 14:51
  • Sorry, a mistake.
    – OOzy Pal
    Jun 2, 2017 at 14:53
  • @ChristianHupfer I have removed that tag (and formatted a bit). OOzyPal Do you mean this blackboard math font?
    – TeXnician
    Jun 2, 2017 at 14:54
  • 1
    @TeXnician: I could have removed the tag also, but I wanted to 'annoy' the O.P. ;-)
    – user31729
    Jun 2, 2017 at 14:55
  • 1
    Your Title is very confusing as you show blackboard bold (double struck) R but you ask for a style like \Re which makes a script R not at all like the image that you show. Jun 2, 2017 at 15:05

1 Answer 1


Very ugly version with \bbtau from package mathbbol and its bbgreekl option. Don't use it ;-)





enter image description here

  • 4
    interestingly enough Unicode only has the math double struck in latin and arabic, not greek..... So if this was used in publication once could apply to extend Unicode... Jun 2, 2017 at 14:56
  • As you said it is ugly :). Also it does not scale well with the other equations. I will just go with \mathbb{T}.
    – OOzy Pal
    Jun 3, 2017 at 8:55
  • @OOzyPal: Well, you asked for \tau in black board letters. \mathbb{T} is black board T ;-)
    – user31729
    Jun 3, 2017 at 9:06

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