indicator

n. 指示器,指示剂
[计算机] 指示符

An indicator or a sighting apparatus on a plane table, used in angular measurement.

旋标装置飞机控制板上的指示器或观测仪，用来测量角度

A hand-held, button-activated input device that when rolled along a flat surface directs an indicator to move correspondingly about a computer screen, allowing the operator to move the indicator freely, as to select operations or manipulate text or graphics.

鼠标一种手用的、用按扭控制的输入设备，当在平台上滑动时可以相应地移动计算机屏幕上的指示箭头，使得操作者可以随意控制指示箭头，由此来选择项目、控制内容或作图