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Added roundcap
Source Link
egreg
egreg
  • 1.3m
  • 147
  • 2.8k
  • 4.5k

You can use the picture environment:

\documentclass{article}
\usepackage{pict2e,picture}
\newcommand{\triplus}{\mathbin{
  \sbox0{$+$}
  \begin{picture}(\wd0,\ht0)
  \put(0,0){\line(1,.577){.5\wd0}}
  \put(.5\wd0,.289\wd0){\line(-1,.577){-.5\wd0}}
  \put(.5\wd0,.289\wd0){\line(0,1){\dimexpr\ht0-.289\wd0\relax}}
  \end{picture}
  }
}

\begin{document}
$a+b\triplus c$
\end{document}

enter image description here

Adding \roundcap, as suggested by Heiko Oberdiek, might be even better:

\documentclass{article}
\usepackage{pict2e,picture}
\newcommand{\triplus}{\mathbin{
  \sbox0{$+$}
  \begin{picture}(\wd0,\ht0)
  \roundcap
  \put(0,0){\line(1,.577){.5\wd0}}
  \put(.5\wd0,.289\wd0){\line(-1,.577){-.5\wd0}}
  \put(.5\wd0,.289\wd0){\line(0,1){\dimexpr\ht0-.289\wd0\relax}}
  \end{picture}
  }
}

\begin{document}
$a+b\triplus c$
\end{document}

enter image description here

You can use the picture environment:

\documentclass{article}
\usepackage{pict2e,picture}
\newcommand{\triplus}{\mathbin{
  \sbox0{$+$}
  \begin{picture}(\wd0,\ht0)
  \put(0,0){\line(1,.577){.5\wd0}}
  \put(.5\wd0,.289\wd0){\line(-1,.577){-.5\wd0}}
  \put(.5\wd0,.289\wd0){\line(0,1){\dimexpr\ht0-.289\wd0\relax}}
  \end{picture}
  }
}

\begin{document}
$a+b\triplus c$
\end{document}

enter image description here

You can use the picture environment:

\documentclass{article}
\usepackage{pict2e,picture}
\newcommand{\triplus}{\mathbin{
  \sbox0{$+$}
  \begin{picture}(\wd0,\ht0)
  \put(0,0){\line(1,.577){.5\wd0}}
  \put(.5\wd0,.289\wd0){\line(-1,.577){-.5\wd0}}
  \put(.5\wd0,.289\wd0){\line(0,1){\dimexpr\ht0-.289\wd0\relax}}
  \end{picture}
  }
}

\begin{document}
$a+b\triplus c$
\end{document}

enter image description here

Adding \roundcap, as suggested by Heiko Oberdiek, might be even better:

\documentclass{article}
\usepackage{pict2e,picture}
\newcommand{\triplus}{\mathbin{
  \sbox0{$+$}
  \begin{picture}(\wd0,\ht0)
  \roundcap
  \put(0,0){\line(1,.577){.5\wd0}}
  \put(.5\wd0,.289\wd0){\line(-1,.577){-.5\wd0}}
  \put(.5\wd0,.289\wd0){\line(0,1){\dimexpr\ht0-.289\wd0\relax}}
  \end{picture}
  }
}

\begin{document}
$a+b\triplus c$
\end{document}

enter image description here

Source Link
egreg
egreg
  • 1.3m
  • 147
  • 2.8k
  • 4.5k

You can use the picture environment:

\documentclass{article}
\usepackage{pict2e,picture}
\newcommand{\triplus}{\mathbin{
  \sbox0{$+$}
  \begin{picture}(\wd0,\ht0)
  \put(0,0){\line(1,.577){.5\wd0}}
  \put(.5\wd0,.289\wd0){\line(-1,.577){-.5\wd0}}
  \put(.5\wd0,.289\wd0){\line(0,1){\dimexpr\ht0-.289\wd0\relax}}
  \end{picture}
  }
}

\begin{document}
$a+b\triplus c$
\end{document}

enter image description here