descriptor
/dɪˈskrɪptə(r)/noun
1- an element or term that has the function of describing, identifying, or indexing in particular标志成分（指具有描述、识别和索引编制功能的成分或词语）, 尤指：
1.1
- Linguistics a word or expression used to describe or identify something【语言学】描写词语, 描述词语。
1.2
- Computing a piece of stored data that indicates how other data is stored【计算机】描述符, 解说符。