In linguistics, diglossia is where two dialects or languages are used by a single language community. In addition to the community's everyday or vernacular language variety, a second, highly codified
The station board of Hapur Junction railway station in North India demonstrating digraphia of two formal registers, Hindi and Urdu, of a common vernacular, Hindustani, an example of triglossia
Hindustani, in its standardised registers, is one of the official languages of both India (Hindi) and Pakistan (Urdu).