I need the command to display this symbol in LaTeX or, at least, its name.

I guess it’s from some kind of a mathematical or informatics discipline. I saw it in article called “A comparison of collapsed Bayesian methods for probabilistic finite automata”. Actually, I have no idea what it is all about: I just started learning LaTeX and I have to copy this article. This symbol is used just as if it is a casual letter like x or y. The line which includes it is,

Input : a(this symbol), N, BurnInTime, SamplingNum, Period


To me this looks like a blackboard bold lowercase a. Specifically, it looks like the lowercase a from the bbold font.

bbold font

For blackboard bold capitals you can use the \mathbb macro provided by the amsfonts or amssymb packages. But $\mathbb{a}$ gives a backwards G.

Instead, you need to load the whole bbold font. Here's a quick snippet to do that.



bbold a

See also Blackboard bold characters

  • 1
    good sleuthing. i would never have gotten this without help. i'm much more accustomed to the shape shown in the unicode charts at U+1D552. Jul 2 '14 at 14:23
  • @barbarabeeton: Thanks. It was a hunch and some quick googling. Knowing that it was used as a variable instead of a binary operation or relation was a hint that it might be a letter of some kind. Jul 2 '14 at 14:37
  • @MatthewLeingang i can't get a a letter with good quality, if i run your code i get a a pixelled, very different to this test. If you can help me!
    – skpblack
    Jul 2 '14 at 14:47
  • @skpblack: Hm, it's possible your installation doesn't have the fonts at the size you want? What does the log file say? Jul 2 '14 at 14:48
  • Something like LaTeX Font Info: Try loading font information for U+bbold on input line 9. ("C:\Program Files\LaTeX\MiKTeX 2.9\tex\latex\jknappen\ubbold.fd" File: ubbold.fd 1996/01/01 Blackboard Bold Font Definition File (jk) ) [1
    – skpblack
    Jul 2 '14 at 14:55

I think Matthew is right, there is the pdffonts output from the article Barbara linked to

name                                 type              emb sub uni object ID
------------------------------------ ----------------- --- --- --- ---------
Times-Roman                          Type 1C           yes no  no     763  0
Times-Bold                           Type 1C           yes no  no     764  0
MTSYB                                Type 1C           yes no  yes    765  0
MTSYN                                Type 1C           yes no  yes    771  0
MarVoSym                             Type 1C           yes no  yes    778  0
Times-Italic                         Type 1C           yes no  no     459  0
MTMI                                 Type 1C           yes no  yes    463  0
BBOLD5                               Type 1C           yes no  yes    480  0
BBOLD7                               Type 1C           yes no  yes    475  0
MTEX                                 Type 1C           yes no  yes    470  0
Courier                              Type 1C           yes no  no     491  0
MSBM10                               Type 1C           yes no  yes    500  0

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