What are those handheld fans called?

Handheld fans are commonly referred to as portable fans or handheld electric fans. They can also be called personal fans or battery-operated fans. Some specific types include:
Mini Fans: Small, compact fans often used for personal cooling.
Pocket Fans: Even smaller fans designed for convenience and portability.
USB Fans: Fans that can be powered via USB connections, making them versatile for use with power banks or computers.
These fans are designed for easy handling and typically provide a convenient way to stay cool on the go.