In fact I want to have a two columns nomenclature in order, but when I write them in order in the result they are not in the order, I have already read the nomencl package : sort by order of appearance, and I have applied the same structure but the problem remains the same. even when I use \nomencalure[order]{symbol}{meaning}. Here is the code:
\immediate\write18{makeindex \jobname.nlo -s nomencl.ist -o \jobname.nls}
\documentclass[preprint,12pt,3p,numbers,sort,compress]{elsarticle}
\usepackage{multicol}
\usepackage{framed}
\usepackage{nomencl}
\makenomenclature
\setlength{\nomitemsep}{-\parskip}
\begin{document}
\section{Introduction}
\label{sec1}
BLABLABLABLABLABALABABLABLABLABLAB\par
LABALABABLABLABLABLABLABALABABLABLAB\par
LABLABLABALABABLABLABLABLABLABALABA
\begin{framed}
\nomenclature[01]{$x_{1}$}{parameter1}
\nomenclature[02]{$x_{2}$}{parameter2}
\nomenclature[03]{$x_{3}$}{parameter3}
\nomenclature[04]{$x_{4}$}{parameter4}
\nomenclature[05]{$x_{5}$}{parameter5}
\nomenclature[06]{$x_{6}$}{parameter6}
\nomenclature[07]{$x_{7}$}{parameter7}
\nomenclature[08]{$x_{8}$}{parameter8}
\nomenclature[09]{$x_{9}$}{parameter9}
\nomenclature[10]{$x_{10}$}{parameter10}
\nomenclature[11]{$\delta$}{parameter11}
\nomenclature[12]{$\theta$}{parameter12}
\nomenclature[13]{$\omega$}{parameter13}
\begin{multicols}{2}
\printnomenclature[1.9cm]
\end{multicols}
\end{framed}
\end{document}
nomenclature. – Sina Ahmadi Feb 22 '19 at 16:27