Definition of Variables

Wikipedia: electrical length

Symbol	Unit	Definition
$\beta$	1 / meter	Wavenumber of wave in conductor $=2\pi /\lambda$
$ϵ$	farads / meter	Permittivity per meter of the dielectric in cable
${ϵ}_0$	farads / meter	Permittivity of free space (constant)
${ϵ}_{\text{eff}}$	farads / meter	Effective relative permittivity per meter of cable
${ϵ}_r$	none	Relative permittivity of the dielectric in cable
$\kappa$	none	Velocity factor of current in conductor $={\nu }_p/c$
$\lambda$	meter	Wavelength of radio waves in conductor
${\lambda }_0$	meter	Wavelength of radio waves in free space
$\mu$	henries / meter	Effective magnetic permeability per meter of cable
${\mu }_0$	henries / meter	Permeability of free space (constant)
${\mu }_r$	none	Relative permeability of dielectric in cable
$\nu$	none	Index of refraction of dielectric material
$\varphi$	radians or degrees	Phase shift of current between the ends of the conductor
$\omega$	radians / second	Angular frequency of alternating current $=2\pi f$
$c$	meters / second	Speed of light in vacuum
$C$	farads / meter	Shunt capacitance per unit length of the conductor
$f$	hertz	Frequency of radio waves
$F$	none	Fraction of space filled with dielectric, fill factor of a transmission line
$G$	none	Electrical length of conductor
$G_0$	none	Electrical length of electromagnetic wave in free space
$l$	meter	Length of the conductor
$L$	henries / meter	Inductance per unit length of the conductor
$T$	second	Period of radio waves
$t$	second	Time
${\nu }_p$	meters / second	Phase velocity of current in conductor
$x$	meter	Distance along conductor