Dell 65W charger with a round barrel pin, commonly used with Inspiron, Latitude, and Vostro laptops:
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Dell 65W Round Pin Charger – Specifications
Power
Power Output: 65 Watts
Output Voltage: 19.5 Volts
Output Current: 3.34 Amps
Input Voltage: 100–240V AC (worldwide compatible)
Input Frequency: 50–60 Hz
Connector Type
Round Barrel Tip (Standard Dell Barrel)
Outer Diameter: 7.4 mm
Inner Diameter: 5.0 mm
Center Pin: Yes (used for smart power identification)
This is often referred to as the 7.4mm x 5.0mm barrel connector with center pin.