A scope

A scope

[′ā skōp]
(electronics)
A radarscope on which the trace appears as a horizontal or vertical range scale and the signals appear as vertical or horizontal deflections. Also known as A indicator; A scan.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
There is a section of Picatinny rail mounted on top of the action that makes mounting a scope easy.