You don’t see these as much now days as many manufactures only make 2 gang 2 way light switches that serve the same purpose (you just don’t use the third L2 terminal on each gang), however I thought we would include it just in case you come across one!
Basically, this is just two single way switches on one face plate
Each of the gangs (or switches) above in Fig 2 (of which there are two) work like this: when the switch is ‘on’ the COM and L1 terminals are connected together. When ‘off’ the COM is connected to nothing.
There are no connections between the two gangs in Fig 2. Each gang is a single discreet switch.