Creating nomenclature with Symbol, Description Unit and different seperations

Question

Hi fellows from the StackExchange Community, I am currently writing my bachelor thesis in Latex (Overleaf) and got into some trouble while creating my nomenclature. Since I found that one of my professors has used a pretty good looking nomenclature in his dissertation I tried to implement the same style into my thesis (I already asked him to help me but unluckily he has written it in word). Due to forum research I was already able to create a nomenclature with the 3 columns und seperations between different kind of symbols, but the lines above and under the symbol lines are driving me crazy. Can somebody help me out?

thanks both of you for your fast answer. My bad, I should posted earlier what I accomplished so far.

I want to have the possibility to maybe write a text between the nomenclature chapter and the first entry of the nomenclature and of course the lines above and under the seperated sections

Here is the code example:

\documentclass[12pt,a4paper]{article}
\usepackage[T1]{fontenc}
\usepackage[margin=1in]{geometry}
\usepackage{color,siunitx}
\usepackage{nomencl}\makenomenclature
% % % % % % % % %% Nomgroup setting: Starting% % % % % % % % %
\renewcommand{\nompreamble}{\markboth{\nomname}{\nomname}}
\newcommand{\chSubtitle}[1]{\item[\large\bfseries#1]}
\newcommand{\DescrWidth}[1]{\parbox[c]{7cm}{#1}}
\newcommand{\chUnit}[1]{\hfill\makebox[1.7cm]{#1\hfill}}
\newcommand{\chnomSeq}[1]{\csname chSymb#1\endcsname}
\renewcommand{\nomgroup}{\chnomSeq}
%=====================================================
%==============Defining Greek Symbols=================
%=====================================================
\newcommand{\chSymbG}{\chSubtitle{Greek Symbols}%
\item [\textbf{Symbol}]%
\textbf{Description}\chUnit{\textbf{Unit}}}
%=====================================================
%===========Defining Roman Symbols====================
%=====================================================
\newcommand{\chSymbR}{\vspace{5mm}\chSubtitle{Roman Symbols}%
\item[\textbf{Symbol}]%
\textbf{Description}\chUnit{\textbf{Unit}}}
%=====================================================
%===========Defining Other Symbols====================
%=====================================================
\newcommand{\chSymbO}{\vspace{5mm}\chSubtitle{Other Symbols}%
\item[\textbf{Symbol}]%
\textbf{Description}\chUnit{\textbf{Unit}}}
%=====================================================
%=====================================================
\newcommand{\chwithUnit}[4]{\nomenclature[#1]{#2}%
{\DescrWidth{#3}\chUnit{#4}}}
\newcommand{\nmG}[4][]{\chwithUnit{G#1}{#2}{#3}{#4}}
\newcommand{\nmR}[4][]{\chwithUnit{R#1}{#2}{#3}{#4}}
\newcommand*{\nmO}[4][]{\chwithUnit{O#1}{#2}{#3}{#4}}
\title{Nomenclature adjustments}
\author{Malte Grube}
% % % % % % % % % % Nomgroup setting: Ending % % % % % % %
\begin{document}
\maketitle
\nmR[E]{$e_b$}{Bilayer elastic curvature energy density}{\si{J/m^2}}
\nmG[O]{$\omega$}{Angular velocity}{\si{rad/sec}}
\nmG[A]{$\theta$}{Angular displacement}{\si{rad}}
\nmR[R]{$R$}{Circle radius}{\si{m}}
\nmR[B]{$B_i$}{Biot number}{-}
\nmO[L]{$L$}{Characteristics length}{\si{m}}
\printnomenclature[3.5cm]
\end{document}

Answer 1

thanks for all your hints. I think I figured it out know, but i dont know if it is a good way to do it.

If you think there is a better way let me know.

So my final Solution looks like

and here is my corresponding Code:

\documentclass[12pt,a4paper]{article}
\usepackage[T1]{fontenc}
\usepackage[margin=1in]{geometry}
\usepackage{color,siunitx}
\usepackage{tabularx}
\usepackage{nomencl}\makenomenclature
% % % % % % % % %% Nomgroup setting: Starting % % % % % % % % %
%\renewcommand{\nomname}{List of Symbols}
\renewcommand{\nompreamble}{Today we write a preamble\markboth{\nomname{}}{\nomname}}
\newcommand{\chSubtitle}[1]{\item[\large\bfseries#1]}
\newcommand{\DescrWidth}[1]{\parbox[c]{7cm}{#1}}
\newcommand{\chUnit}[1]{\hfill\makebox[6em][l]{#1 \hfill}\ignorespaces}
\newcommand{\chnomSeq}[1]{\csname chSymb#1\endcsname}
\renewcommand{\nomgroup}{\chnomSeq}
%Table Design
\newcommand{\Answer}[1]{\smash{\begin{tabularx}{\textwidth}{X l} \hline #1 \ \hline \end{tabularx}\hspace*{-\tabcolsep}}}
%=====================================================
%==============Defining Greek Symbols=================
%=====================================================
\newcommand{\chSymbG}{\chSubtitle{\Answer{Greek Symbols}}%
\vspace{5mm}\item [\textbf{Symbol}]%
\textbf{Beschreibung}\chUnit{\textbf{Einheit}}}
%=====================================================
%===========Defining Roman Symbols====================
%=====================================================
\newcommand{\chSymbR}{\chSubtitle{\Answer{Roman Symbols}}%
\vspace{5mm}\item[\textbf{Symbol}]%
\textbf{Description}\chUnit{\textbf{Einheit}}}
%=====================================================
%===========Defining Other Symbols====================
%=====================================================
\newcommand{\chSymbO}{\chSubtitle{\Answer{Other Symbols}}%
\vspace{5mm}\item[\textbf{Symbol}]%
\textbf{Beschreibung}\chUnit{\textbf{Einheit}}}
%=====================================================
%=====================================================
\newcommand{\chwithUnit}[4]{\nomenclature[#1]{#2}%
{\DescrWidth{#3}\chUnit{#4}}}
\newcommand{\nmG}[4][]{\chwithUnit{G#1}{#2}{#3}{#4}}
\newcommand{\nmR}[4][]{\chwithUnit{R#1}{#2}{#3}{#4}}
\newcommand*{\nmO}[4][]{\chwithUnit{O#1}{#2}{#3}{#4}}
\title{Nomenclature adjustments}
\author{Malte Grube}
% % % % % % % % % % Nomgroup setting: Ending % % % % % % %
\begin{document}
\maketitle
%=====================================================
%===================Roman Symbols ====================
%=====================================================
\nmR[E]{$e_b$}{Bilayer elastic curvature energy density}{J/m$^2$}
\nmR[RE]{$\theta$}{Angular displacement}{rad}
\nmR[R]{$R$}{Circle radius}{m}
\nmR[B]{$B_i$}{Biot number}{-}
\nmR[RF]{$\omega$}{Angular displacement}{rad}
%=====================================================
%===================Greek Symbols ====================
%=====================================================
\nmG[O]{$\omega$}{Angular velocity}{kg/s}
\nmG[A]{$\theta$}{Angular displacement}{rad}
%=====================================================
%===================Other Symbols ====================
%=====================================================
\nmO[RA]{$\theta$}{Angular displacement}{rad}
\nmO[RU]{$\theta$}{Angular displacement}{rad}
\nmO[L]{$L$}{Characteristics length}{m}
\nmO[RE]{$\theta$}{Angular displacement}{rad}
\printnomenclature[4cm]
\end{document}