The Chinese word for indicator is
指示灯

zhǐ shì dēng

Chinese Definition

indicator
1. 名词. 食指(伸肌)
2. 名词. 指示器
3. 名词. 指示剂
4. 名词. 指示物
5. 名词. 找矿标志
Components
指
1. finger
手指 - finger
2. to point; to point out; to aim
指出 - to point out
指人 - to point at a person
3. to indicate; to show; to demonstrate
4. to refer to; to mean
春天指的是冬天後面的那個季節。 - Spring refers to the season after winter.
5. to rely on; to depend on
6. to criticize; to rebuke
7. to make one’s hair stand on end
示
1. to show; to reveal; to indicate; to notify; to instruct
2. Variant of 置
3. Variant of 祇
灯
1. Simplified form of 燈

指示符
1. n. indicator

指針
1. n. (literally) needle; indicator; hand on a clock
2. n. (figuratively) guiding principle; guide
3. n. (programming, mainland) pointer
空-指針異常 - null pointer exception