What Does VDR Stand For?

VDR stands for North Vietnam ISO 3166 Trigram Obsolete 1977

VDR refers to the "North Vietnam ISO 3166 Trigram Obsolete 1977," which was an identifier designated for North Vietnam prior to the adoption of updated ISO standards. This trigram code was part of an early effort to standardize country codes for international use but has since been rendered obsolete and replaced by more current identifiers reflecting the unified state of Vietnam.