Type53 is common name for a 53cm torpedo manufactured in Russia.
With the exception of the UGST which uses Mark 48 style monopropellants, Soviet 53cm torpedoes generally use electric or kerosene mixed with various oxidizers for propulsion.
Russian torpedoes are often named descriptively for their characteristics - examples include "acoustic homing" or "electric torpedo", all in Russian acronyms.
Torpedoes were used by Japan in the Russo-Japanese War and were widely employed in World War I. The torpedoes used in World War II were usually 20 to 24 ft (6.1–7.3 m) long, carrying up to 600 lb (272 kg) of explosives at a speed of 50 knots for more than 10,000 yd (9,144 m).
The first torpedoes driven at specific targets were spar torpedoes; the explosive device was on the end of a spar up to 40 feet long projecting forward under water from the bow of the attacking vessel.
In the case of deck or tube launched torpedoes, the diameter of the torpedo is obviously a key factor in determining the suitability of a particular torpedo to a tube or launcher, similar to the caliber of the gun.