What is the meaning of writing a catalyst name with two compounds split by a hyphen?
If we consider palladium on carbon or alumina then it means that the palladium particles are dispersed onto the carbon or alumina. The carbon or alumina acts as a support for the catayltic particles of the palladium.

If we consider Lindlar's cataylst this can be written as Pd/CaCO3/Pb

The Pd (palladium) is the hydrogenation cataylist
The CaCO3 is the support
The Pb is a poison which is used to modify the chemistry of the palladium

Sometimes one of the things separated by a / line is either a promotor or a poison.