這個符號的語法是什么？

解答動態(tài)

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  \mkern-4mu\midscript{\blackright}\else
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  \mkern-4mu\midscript{\blackright}\fi}}\newcommand\ROCr{\ThisStyle{\if D\m@開關(guān)\midscript{\blacktriangeleft}\mkern-4mu\Bigr}\else\midscript{\blacktriangeleft}\mkern-4mu}\fi}}\makeatother\newcommand\ROC[3]{\subdepth{1}\ROCl{2\ROCr\subdepth{3}}\begin document}\[\ROC{\sigma\u L}{X（s）}{\sigma\u H}\]\centering$\ROC{\sigma\u L}{X（s）}{\sigma\u H}$\end{document}
  ｜ A區(qū)分顯示和文本樣式的版本（不要在下標中嘗試）
  \documentclass[twoocolumn]{article}%twoocolumn僅用于較小的圖片\usepackage{amath，amssymb}\makeatletter\newcommand{\rocl}[3]%{1=左邊界，｜2目前，該函數(shù)?3?3 PACE{-4.5mu}\vcenter{\hbox{$\scriptstyle\BlackTriangalRight$}%\，{3}\，\vcenter{\hbox{$\scriptstyle\BlackTriangalLeft$}}%\mspace{-4.5mu}{\Big}}{4}%\else{\vphantom{\Big}}}}{2}\kern-\scriptspace\Big}%\mspace{-4.5mu}\vcenter{\hbox{$\scriptstyle\BlackTriangalRight$}%\，{3}\，\北京市政府管理層{{\HBO{{\\\hbox{{\\\\\\\\\\\nOOOX{{4.5mu}}{{{{\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\17部分經(jīng)濟}}}}\\\\msspace{}}}{4.5}}{{{后面有一些文本。\end{document}
  
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