I would like to have commands \leftsemicirc, \rightsemicirc in math mode which produce left/right semicircles the size of \circ.

The best approximation of a solution I am aware is to use bbding and writing \text{HalfCircleLeft}, however this is solid and most importantly it's too big.


  • 1
    what are the symbols supposed to represent? – Thruston Oct 20 '17 at 16:27
  • 1
    open or closed? Unicode provides closed half circles: ◖◗ which you could use with an appropriate font... – Thruston Oct 20 '17 at 16:29
  • @Apparently open (or not filled) as the OP 'complains' aobut `HalfCircleLeft being solid – user31729 Oct 20 '17 at 16:46

You can manually draw these using the graphics package and \put, \oval and \line commands. I understand you don't want filled semicircles, but I didn't know if you wanted open or closed. Both appear below. Also, I included a \newcirc so it is exactly the same size as the semicircles.




$A\circ B$\\
$A\mathbin{\leftsemicirc} B$\\
$A\mathbin{\rightsemicirc} B$\\
$A\mathbin{\cleftsemicirc} B$\\
$A\mathbin{\crightsemicirc} B$\\
$A\mathbin{\newcirc} B$


enter image description here

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