enter image description here

I designated "D" on the image.

What is this math font called?


Thanks in advance.

  • 3
    It's just sans-serif. Try \mathsf{D}? – Au101 Dec 29 '16 at 4:14
  • Thanks! Then how about to make it bold? I tried \mathbf{\mathsf{D}} , but it does not works. – Jay Lee Dec 29 '16 at 4:23
  • Computer Modern does not have a bold sans-serif face, you will have to select a font that does have such a face – Au101 Dec 29 '16 at 4:24
  • 1
    Also unlike text font commands \mathxx fonts do not combine so you would need to declare a new math alphabet for bold sans not use \mathbf{\mathsf – David Carlisle Dec 29 '16 at 17:18

You can either define your own math alphabet (here \mathbfsf) for bold sans-serif


$\mathsf{D}$ $\mathbfsf{D}$


or you can use the bm package


$\mathsf{D}$ $\bm{\mathsf{D}}$


The output is in both cases

enter image description here

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