1. An electronic device that can send and receive radio waves. 2. The part of a reader that can send and receive radio waves. It is also called an "antenna".

In computer science, an optical scanning device that reads texts which have been converted into a special bar code.

1. An electronic device that generates a digital representation of an image for data input to a computer.
2. An optical device that reads a printed page or transparency and converts it into a graphics image for a computer.

The scanner does not recognize, nor differentiate, in any manner the content of the material it is scanning. Everything is converted into a bitmapped image, which is a pattern of dots.

An instrument for reading bands on paper strips or gel, for the purpose of measuring particle movements because of electrophoresis.

A program that performs the diagnostic phase of an analysis, also known as a computer assessment: A vulnerability scanner analysis defines, identifies, and classifies the security holes (vulnerabilities) in a computer, server, network, or communications infrastructure.

In addition, a vulnerability scanner functions as an analysis which can forecast the effectiveness of proposed countermeasures, and evaluate how well they work after they are put into use.