%%
%% The LaTeX Companion, 3ed
%%
%% Example 4-1-4 on page I-257 in "Customizing the \protect \nxLenv  {enumerate} list environment".
%%
%% Copyright (C) 2022 Frank Mittelbach
%%
%% It may be distributed and/or modified under the conditions
%% of the LaTeX Project Public License, either version 1.3c
%% of this license or (at your option) any later version.
%%
%% See https://www.latex-project.org/lppl.txt for details.
%%

\documentclass{tlc3exa}
\pagestyle{empty}
\setcounter{page}{6}
\setlength\textwidth{111.0pt}
%StartShownPreambleCommands
\usepackage{pifont}
\renewcommand\labelenumi{\theenumi}
\renewcommand\theenumi
             {\protect\ding{\inteval{171+\value{enumi}}}}
%StopShownPreambleCommands

\begin{document}
\begin{enumerate}
\item item of list \label{l1} \item item of list \label{l2}
\item item of list \label{l3} \item item of list \label{l4}
\end{enumerate}
l1=\ref{l1} l2=\ref{l2} l3=\ref{l3} l4=\ref{l4}
\end{document}
