I want to type a big circle with dot sign inside it in LibreOffice Writer formula editor, but I do not find any such usage in LO wikis or tutorials. The following shows an example of what I want to achieve:
Note the circle beside M in the second fraction. Any ideas?
3{ M over M_{ {}odot{}} }nitalic {km}
You will need to increase the font size for operators in this formula in Format > Font Size. The empty group {} before and after the keyword odot is needed, because it is an operator and requires two operands.
3{ M over M_{ size*1.5"⊙"} }nitalic {km}
Here the symbol ⊙ is a text. You can insert this character into a text document. You find it in the Special Character dialog with unicode U+2299. You can use font “OpenSymbol”. Then copy it to clipboard in the text document and paste it from clipboard into the command window in Math. You need to increase its size. You can do that directly using the size command or you increase the font size for indices in general in Format > Font Size.
You want the “Circled Dot Operator” unicode character (⊙), right?
In a [blank if you like] Writer document, type 2299 then press Alt+X. Alt+X turns the hexadecimal number directly to the left of the cursor into the corresponding unicode character. You then copy it into the formula.
I found this character by searching for “circled dot” in the “gucharmap” utility in Linux. Another match was 2A00 (⨀), which is described as “N-ary Circled Dot Operator”.
edit: I noticed after posting that @regina beat me to it as I was researching and typing, but I’ll leave this here in case it’s helpful, since I mention some different aspects.
