Working of DPST - Double Pole, Single Throw Switch

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How to Wire a Double Pole, Single Throw Switch to 120V, 240V and 230V appliances according to NEC and IEC
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Hello, I have a 20 AMP double pole switch that works as follows: Its a Light switch in a guest bedroom with a Neutral (on the Top Left), Black Hot wire (on the Top Right) and Red Cable (on the Bottom Right). This Bottom right cable is only HOT when the master bedroom light switch is turned on). The Bottom Left terminal is blank. The house was built in the 20's and this setup I am told was used as security feature to turn on lots of bedroom ceiling lights from one dedicated switch in the master bedroom. When the master bedroom switch is in the ON and the Red Cable is hot the guest bedroom light switch remains on thereby keeping the ceiling lights illuminated. Can you describe how many throws it has? Thank you!

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