Descriptor

Descriptor may refer to:
 * An identifier

In computer science:
 * Billing descriptor, the merchant's name that appears on a credit card statement
 * Short Payment Descriptor, a compact data format for an easy exchange of a payment information using modern electronic channels
 * Data descriptor, a software or hardware structure describing data
 * Visual descriptors, a representation of visual features in image or video
 * Security descriptor, a Windows data structure containing security information
 * Segment descriptor, used for memory addressing in x86 computer architectures
 * Index term, also known as a "descriptor" in information retrieval
 * File descriptor, an abstract key for accessing a file

In chemistry:
 * Molecular descriptor, which helps characterize a chemical compound
 * Descriptor (chemistry), a prefix used to specify a chemical name

In languages:
 * Epithet, a descriptive term (word or phrase), accompanying or occurring in place of a name and having entered common usage