I’d guess at:
http://www.linux-usb.org/usb-ids.html
USB devices are identified by a vendor id and product id, which can be seen on the output of lsusb
, which consists of lines like the following:
Bus 001 Device 003: ID 058f:a001 Alcor Micro Corp. HP Webcam-101
Where the vendor ID is 058f
and the product id is a001
.