答案1
enumitem
在包和的帮助\blacktriangleright
下amssymb
:
\documentclass{article}
\usepackage{enumitem}
\usepackage{amssymb}
\begin{document}
\begin{itemize}[label={$\blacktriangleright$}]
\item first item
\item second item
\item[$\blacktriangleright\blacktriangleright$] third item
\item[$\blacktriangleright\hspace{-0.5ex}\blacktriangleright$] third item
\end{itemize}
\end{document}