Roman Number Symbols

Question

I am looking for a latex package which supports roman number symbols. Particularly alternative / ancient roman symbols should be included in this package.

To be more precise, I currently need a symbol for thousand which looks like "(I)" or "CIↃ".

Answer 1

Unicode with LuaLaTeX/XeLaTeX and Linux Libertine

An example with the OpenType font Linux Libertine, tested with LuaLaTeX and XeLaTeX. The characters can be used inside \textroman directly by the right Unicode characters or via macros \textroman....

(Update: Using \encodingdefault instead of EU2 to support XeLaTeX.)

\documentclass{article}
\usepackage{fontspec}

\newfontfamily\fontlibertine{Linux Libertine O}

\DeclareTextFontCommand{\textroman}{\fontlibertine}

% Using \encodingdefault, because LuaLaTeX uses EU2 and XeLaTeX EU1
\DeclareTextSymbol{\textromanOne}{\encodingdefault}{"2160}
\DeclareTextSymbol{\textromanTwo}{\encodingdefault}{"2161}
\DeclareTextSymbol{\textromanThree}{\encodingdefault}{"2162}
\DeclareTextSymbol{\textromanFour}{\encodingdefault}{"2163}
\DeclareTextSymbol{\textromanFive}{\encodingdefault}{"2164}
\DeclareTextSymbol{\textromanSix}{\encodingdefault}{"2165}
\DeclareTextSymbol{\textromanSeven}{\encodingdefault}{"2166}
\DeclareTextSymbol{\textromanEight}{\encodingdefault}{"2167}
\DeclareTextSymbol{\textromanNine}{\encodingdefault}{"2168}
\DeclareTextSymbol{\textromanTen}{\encodingdefault}{"2169}
\DeclareTextSymbol{\textromanEleven}{\encodingdefault}{"216A}
\DeclareTextSymbol{\textromanTwelve}{\encodingdefault}{"216B}
\DeclareTextSymbol{\textromanFifty}{\encodingdefault}{"216C}
\DeclareTextSymbol{\textromanHundred}{\encodingdefault}{"216D}
\DeclareTextSymbol{\textromanFivehundred}{\encodingdefault}{"216E}
\DeclareTextSymbol{\textromanThousand}{\encodingdefault}{"216F}

\DeclareTextSymbol{\textromanone}{\encodingdefault}{"2170}
\DeclareTextSymbol{\textromantwo}{\encodingdefault}{"2171}
\DeclareTextSymbol{\textromanthree}{\encodingdefault}{"2172}
\DeclareTextSymbol{\textromanfour}{\encodingdefault}{"2173}
\DeclareTextSymbol{\textromanfive}{\encodingdefault}{"2174}
\DeclareTextSymbol{\textromansix}{\encodingdefault}{"2175}
\DeclareTextSymbol{\textromanseven}{\encodingdefault}{"2176}
\DeclareTextSymbol{\textromaneight}{\encodingdefault}{"2177}
\DeclareTextSymbol{\textromannine}{\encodingdefault}{"2178}
\DeclareTextSymbol{\textromanten}{\encodingdefault}{"2179}
\DeclareTextSymbol{\textromaneleven}{\encodingdefault}{"217A}
\DeclareTextSymbol{\textromantwelve}{\encodingdefault}{"217B}
\DeclareTextSymbol{\textromanfifty}{\encodingdefault}{"217C}
\DeclareTextSymbol{\textromanhundred}{\encodingdefault}{"217D}
\DeclareTextSymbol{\textromanfivehundred}{\encodingdefault}{"217E}
\DeclareTextSymbol{\textromanthousand}{\encodingdefault}{"217F}

\DeclareTextSymbol{\textromanThousandCD}{\encodingdefault}{"2180}
\DeclareTextSymbol{\textromanFiveThousand}{\encodingdefault}{"2181}
\DeclareTextSymbol{\textromanTenThousand}{\encodingdefault}{"2182}
\DeclareTextSymbol{\textromanCreversed}{\encodingdefault}{"2183}
\DeclareTextSymbol{\textromancreversed}{\encodingdefault}{"2184}


\begin{document}

\newcommand*{\test}[2]{%
  \textsf{U+#1}
  & \textsf{\textbackslash textroman#2}
  & \textroman{\csname textroman#2\endcsname}
  & \textroman{\bfseries\csname textroman#2\endcsname}
  & \textroman{\itshape\csname textroman#2\endcsname}
  \tabularnewline
}

\begin{tabular}{lllll}
\test{2160}{One}   
\test{2161}{Two}   
\test{2162}{Three} 
\test{2163}{Four}   
\test{2164}{Five}   
\test{2165}{Six}    
\test{2166}{Seven}  
\test{2167}{Eight}  
\test{2168}{Nine}   
\test{2169}{Ten}    
\test{216A}{Eleven} 
\test{216B}{Twelve} 
\test{216C}{Fifty}  
\test{216D}{Hundred}
\test{216E}{Fivehundred}
\test{216F}{Thousand}
\test{2170}{one}   
\test{2171}{two}   
\test{2172}{three} 
\test{2173}{four}   
\test{2174}{five}   
\test{2175}{six}    
\test{2176}{seven}  
\test{2177}{eight}  
\test{2178}{nine}   
\test{2179}{ten}    
\test{217A}{eleven} 
\test{217B}{twelve} 
\test{217C}{fifty}  
\test{217D}{hundred}
\test{217E}{fivehundred} 
\test{217F}{thousand}    
\test{2180}{ThousandCD}  
\test{2181}{FiveThousand}
\test{2182}{TenThousand}
\test{2183}{Creversed}
\test{2184}{creversed}
\end{tabular}

\bigskip
\begin{tabular}{ll} 
\multicolumn{2}{l}{Unsupported:}\\[1ex]
\textsf{U+2185} & roman numeral six late form\\
\textsf{U+2186} & roman numeral fifty early form\\
\textsf{U+2187} & roman numeral fifty thousand\\
\textsf{U+2188} & roman numeral one hundred thousand
\end{tabular}      

\end{document}      

Reversed C with \reflectbox

Ↄ can be generated using \reflectbox of package graphics:

\documentclass{article}
\usepackage{graphicx}% or graphics
\usepackage{amstext}

\newcommand*{\textCreversed}{\text{\reflectbox{C}}}

\begin{document}

CI\textCreversed\textsuperscript{CI\textCreversed}

\end{document}