An input device that is able to interpret pencil marks on paper media is known as Optical Mark Reader.
Optical Mark reading (OMR) is a method of entering data into a computer system. Optical Mark Readers reads pencil or pen marks made in pre-defined positions on paper forms as responses to questions or tick list prompts.
OCR (optical character recognition) and OMR (optical mark recognition) are specialized systems that convert images on a paper to a format that is easily readable and processed by a computer. ... They function by reading images by scanner, which recognizes and deciphers them into an electronic form.