1. a number or ratio (a value on a scale of measurement) derived from a series of observed facts; can reveal relative changes as a function of time

2. a signal for attracting attention

3. a device for showing the operating condition of some system

4. (chemistry) a substance that changes color to indicate the presence of some ion or substance; can be used to indicate the completion of a chemical reaction or (in medicine) to test for a particular reaction

1.指示物;指标
Anindicator is a measurement or value which gives you an idea of what something is like.

e.g. ...vital economic indicators, such as inflation, growth and the trade gap...
重要的经济指标,例如通货膨胀、增长与贸易逆差
e.g. The number of wells is a fairindicator of the demand for water.
水井的数量能较准确地反映水需求量的大小。

2.(汽车上的)转向指示灯，转向灯
A car'sindicators are the flashing lights that tell you when it is going to turn left or right.

1. indicator什么意思

1. 指示器：当使用new获得一个指向一片内存的指针时,在该片内存前有一个指示器(indicator)至于为什么C++中未内建垃圾收集器(Garbage Collection)的原因,

2. 指示剂：指示剂 指示剂(indicator)是能由某些物质存在的影响而改变自己颜色的物质. 主要用于容量分析中指示滴定的终点. 一般可分为酸碱指示剂、氧化还原指示剂、吸附指示剂等. 指示剂除分析外,也可用来检验气体或溶液中某些有害有毒物质的存在.

3. 指示符：内容标识符(content designator):用于识别数据元素,或提供有关数据元素的附加信息的符号或编码,内容标识符包括字段标识(Tag), 指示符(indicator)和子字段标识符(Sub-field identifier).