What are 1-phase and 3-phase AC power connectors & standards?

IEC 60309 - Wikipedia

Single and 3-Phase Power Calculator – Blackhawk Supply

mains - Why is the three-phase voltage 440V, if single-phase alone is 230V? - Electrical Engineering Stack Exchange

How to wire a single phase from a 3-phase - Quora

Single-Phase vs 3-Phase Power Protection: What You Need to Know

16A 32A Type 2 plug with 7m Cable for EV side IEC 6219-2 European standard male plug Single phase Three phase IEC female AC plug - AliExpress

Receptacles now fitted with beryllium copper contact clip

An introduction to three-phase power and PDUs

Three-Phase Power Explained

Why and how are medical connectors and standards different?

Electrical Wiring Color Codes - ElectronicsHub USA