descriptor

noun
1
a word or expression used to describe or identify something
توصیف‌کننده, واژه توصیف‌گر, عبارت مشخص‌گر
2
a piece of additional information that describes the purpose and format of other data
توصیف‌گر
The Global Descriptor Table is a data structure used to define the characteristics of the various memory areas used during program execution.