SCSI (Small Computer Systems Interface) cables are used to connect peripherals (up to 16 devices) together using a single cable.
There are both parallel and serial versions of SCSI cables. There are many different terminations for these, such as DB-25, 50 pin, 68 pins and more, internal and external facing, as well as male and female variants.
People may remember back, around the days of CD ROMs and IDE drives, you would load bios and assign a SCSI ID to your devices.
These cables are mostly used in legacy devices.