Pin type options in Cadence Virtuoso

Hello,

I have a question about the options for creating pins in Cadence virtuoso, there are many types to select, for example, power, ground, signal, clock ..etc.

Do they have physical meaning during the circuit simulation or real chip fabrication after exporting the gds file?

I have realized lately that I am using "signal" type even for creating the vdd! and the gnd! global and the clock pins in my design.

Thank you

Regards