Hcfyk

I have been trying to typeset the character GREEK LETTER KOPPA. It has not been working. I know the Unicode number (U+03DE), and tried the command ^^3de and ^^3DE. Neither worked. I also tried char and char", but those didn't work either, other symbols get produced.

Does anybody have an idea as to how I can get my computer to typeset the symbol Ϟ?

MWE:

documentclass[a4paper, 12pt]{article}  

usepackage[ngerman, polutonikogreek]{babel}  

usepackage[T1]{fontenc}  

usepackage[utf8]{inputenc}  

usepackage{arevmath}  

usepackage{lmodern}  

fontfamily{lmr}selectfont  

usepackage{geometry}  

 geometry{  

 a4paper,  

 top=30mm,  

 left=25mm,  

 right=20mm,  

 bottom=20mm,  

 }  



begin{document}  

selectlanguage{ngerman}  



$Koppa$  



end{document}

Using arevmath package you have the request symbol.

documentclass{article}

usepackage{arevmath}

begin{document}



$Koppa$



end{document}

You have it in the cm-unicode fonts, to be used with xelatex. They also have the archaic koppa. If you can type it directly on your keyboard, XeLaTeX will understand it. Other than that I defined two commands to obtain them (note the hexadecimal code is not the official unicode hexadecimal number):

documentclass[12pt]{article}

usepackage{fontspec}

setmainfont{CMU Serif}

defkoppa{char "03DF}

defarchaickoppa{char "03D9}



begin{document}



koppa: qquad LARGEkoppaqquad ϟ



{normalsize archaic koppa: qquad}archaickoppaqquad ϙ





end{document} 

If you have a font on your system that you know has that character you can use a package such as fontspec or mathspec to typeset your document (either whole or part, as you prefer) in that font.

Here is one definition that works with the modern toolchain. It requires LuaLaTeX or XeLaTeX and an OpenType or TrueType font containing the glyph.

documentclass[varwidth]{standalone}

usepackage{mathtools}

usepackage{unicode-math}



defaultfontfeatures{Scale = MatchLowercase }

setmainfont{DejaVu Serif}[Scale = 1.0]

setmathfont{TeX Gyre DejaVu Math}



newcommandkoppa{ifmmode%

{mathord{text{^^^^03de}}}else%

^^^^03defi}



begin{document}

Here is the symbol koppa.



( koppa = koppa_{koppa_koppa} )

end{document}

There are other ways to declare the symbol as well, including loading a font containing Ϟ as a symbol alphabet and using DeclareMathSymbol, or loading the symbol in text mode from a newfontfamily declared with fontspec, or defining it with newunicodechar, or loading all Greek letters from that Unicode block with ucharclasses, or finding an OpenType math font that has the glyph, or plain TeX char"03DE, or symbol{"03DE}.