diff --git a/style/symbols.sty b/style/symbols.sty
index a1c9dbe4369514ce11c7d7b96da07de0ce632cc9..b112da420cc2242b81dd8631bbdaaba84db4b21d 100644
--- a/style/symbols.sty
+++ b/style/symbols.sty
@@ -63,6 +63,17 @@
 \newcommand{\angVel}{\ensuremath{\Omega}}
 \nomenclature[G]{\angVel}{Angular velocity\nomunit{\per\s}}
 
+% Ratios
+\newcommand{\infRat}{\ensuremath{\lambda}}
+\newcommand{\infRati}{\ensuremath{\lambda}}
+\newcommand{\swRat}{\ensuremath{\xi}}
+\newcommand{\swRati}{\ensuremath{\xi}}
+\newcommand{\advRat}{\ensuremath{\mathcal{J}}}
+
+\nomenclature[G]{\infRat}{Inflow ratio, $\frac{\vAx}{\angVel\radius}$\nomunit{\per\s}}
+\nomenclature[G]{\infRati}{Induced inflow ratio, $\frac{\viAx}{\angVel\radius}$\nomunit{\per\s}}
+\nomenclature[G]{\swRat}{Swirl ratio, $\frac{\vTg}{\angVel\radius}$\nomunit{\per\s}}
+\nomenclature[G]{\swRati}{Induced swirl ratio, $\frac{\viTg}{\angVel\radius}$\nomunit{\per\s}}
 
 % --- Angles -------------------------------------------------------------------
 \newcommand{\aoa}{\ensuremath{\alpha}}
@@ -98,18 +109,20 @@
 \nomenclature[A]{\radA}{Absolute radial position\nomunit{\m}}
 
 % Surfaces
-\newcommand{\area}{\ensuremath{A}} % (Rotor) Area
+\newcommand{\area}{\ensuremath{A}}
 \nomenclature[A]{\area}{Area\nomunit{\m^2}}
 
 % --- Non-dimensional ----------------------------------------------------------
-\newcommand{\advRat}{\ensuremath{\mathcal{J}}} % Advance ratio
-\newcommand{\mach}{\ensuremath{\mathcal{M}}} % Mach number
-\newcommand{\reynolds}{\ensuremath{Re}} % Reynolds number
-% solidity
+\newcommand{\mach}{\ensuremath{\mathcal{M}}}
+\newcommand{\reynolds}{\ensuremath{Re}}
+\newcommand{\sol}{\ensuremath{\sigma}}
+\newcommand{\solL}{\ensuremath{\sigma_l}}
 
 \nomenclature[A]{\advRat}{Advance ratio\nomunit{-}}
 \nomenclature[A]{\mach}{Mach number\nomunit{-}}
 \nomenclature[A]{\reynolds}{Reynolds number\nomunit{-}}
+\nomenclature[G]{\sol}{Rotor solidity, $\frac{\nBlades\chord}{\pi\radius}$\nomunit{-}}
+\nomenclature[G]{\solL}{Local solidity, $\frac{\nBlades\chord(\radA)}{\pi\radius}$\nomunit{-}}
 
 
 % --- Others -------------------------------------------------------------------