If you are looking for a hardware device that generates signals (like sine or square waves) via USB, several options are available from electronics and lab equipment retailers:

: A professional-grade software and hardware solution that allows you to point-and-click to control modular function generators and visualize multiple instruments simultaneously.

: A multi-function USB instrument that acts as a 125 MS/s oscilloscope, waveform generator, and logic analyzer.

: A specialized USB device used to generate true random numbers for security and cryptographic applications. 2. "Generating" a Bootable USB Drive