What does TWARDY stand for? 

twardy

The PT-91 Twardy (Polish pronunciation: [ˈtfar.dɨ], English: Tough) is a Polish main battle tank. A development of the T-72M1, it entered service in 1995. The PT-91 was designed at the OBRUM (Ośrodek Badawczo-Rozwojowy Urządzeń Mechanicznych, or Research and Development Centre for Mechanical Appliances) and is produced by the Bumar Łabędy company, part of the Bumar Group, a Polish technical military consortium. Changes from the T-72M include a new dual-axis stabilized fire-control system, reactive armour, a more powerful engine, transmission and new automatic loader. Unlike many other T-72 upgrades, Polish Army PT-91s feature elements created almost exclusively by domestic companies, including the new engine, fire control system, and all communication system elements. Many of the elements were used to upgrade existing fleets of T-72 tanks in countries including the Czech Republic (T-72M4 CZ), Georgia (T-72SIM-1), and India (T-72 Ajeya Mk. 2). A total of 232 PT-91 tanks were delivered to the Polish Land Forces: 92 newly built vehicles and 140 from refurbished T-72A and T-72M1 tanks, designated PT-91M1 and PT-91MA1, respectively.

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