Haidari
A name given to the double Rupee of Mysore by Tipu Sultan, in 1786, when he adopted his new system of reckoning, based on the Muludi, i.e., dating from the birth of the Prophet. The coin is so called from Haidar, a surname of the first Imam.
Synonyms: Heideri
Source: Frey's Dictionary (American Journal of Numismatics, Vol. 50, 1916)