I need to put a circle (ring, zero etc.) below or inside a \Lambda letter.

I need to do so both in math mode of LaTeX document and in mathtext mode of matplotlib - so my choice of commands is limited.

If I use \stackrel{\Lambda}{\circ} then lambda is to small.

\Lambda\!\!\!\!\!\circlooks like bad 'A'.

I even have considered to go with upper accent. Results look bad. In \mathring{\Lambda} ring is to small and not centered. In \Lambda\ocirc ring size is acceptable, but it overlaps with lambda (and is not centered).

2 Answers 2


NOTE: OP indicates this method does not work for his application, because package imports are not allowed.

Nonetheless, here it is for regular LaTeX, in two forms:

(1) Without smaller math styles:

Here is \circLambda

$A \circLambda$

enter image description here

(2) Here it is for smaller mathstyles:

Here is \circLambda

$A \circLambda \scriptstyle\circLambda \scriptscriptstyle\circLambda$

enter image description here

  • 1
    I am afraid I can not import any packages in mathtext mode of matplotlib, can I?
    – abukaj
    Nov 7, 2018 at 20:25

Without packages.






enter image description here

  • I am arfraid I can not define macros in mathtext mode of matplotlib. I have tried to unfold the macro to \makeatletter \mathpalette \ooalign{% $\m@th#1\Lambda$\cr \hidewidth \raisebox{-.52\height}[0pt][0pt]{% $\m@th#1\mskip-0.9mu\nonscript\mskip-0.2mu\mathring{}$% }% \hidewidth\cr } \relax \makeatother, but all I got is: Unknown symbol: \makeatletter (at char 0), (line:1, col:1) How shall I unfold it properly?
    – abukaj
    Nov 8, 2018 at 19:03
  • @abukaj Then you're doomed, sorry.
    – egreg
    Nov 8, 2018 at 23:07

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