This is an architectural element which projects from a wall and supports beams and cornices.

A scanners  is a light sensing  input devices  that reads printed text and graphics  and translates the results into a  form  the computer can process .A flatbed scanner  works in a manner  similar to a copy machine  except  it creates a file of the document.Optical Character  recognition (OCR) reads characters from ordinary documents  optical mark recognitions(OMR) reads handrawn marks such as small circles .A bar code scanner is an optical  reader that uses laser beams to read a bar code ,or identifications code .MICR (magnetic -ink-character recognition) reads  text printed  with magnetized ink.