The peripheral that belongs to the category of special purpose peripherals is:

Peripheral device

• A peripheral device or peripheral is an auxiliary hardware device used to transfer information into and out of a computer.
• The term peripheral device refers to all hardware components that are attached to a computer and are controlled by the computer system, but they are not the core components of the computer.
• Peripherals are commonly divided into three kinds: input devices, output devices, and storage devices.
• An input device converts incoming data and instructions into a pattern of electrical signals in binary code that are comprehensible to a digital computer. Examples: Keyboard, Mouse
• An output device reverses the process, translating the digitized signals into a form intelligible to the user. Examples: Printer, Monitor, Speaker.
• Storage devices are used for storing data. Examples: DVD, Pendrive, Floppy.
• Programmable keyboards and display interface belong to the category of special-purpose peripherals because these are used for interfacing a microprocessor to a specific type of I/O device.
• These peripherals are more complex and therefore, relatively more expensive than general-purpose peripherals.