 China Chinese weapons and military vehicles are often, but not always, designated according to the Gregorian calendar, the one used by most nations. Two digits are used to designate the year. The two digits appear first, followed by the character shi, meaning "type".Blasko, Dennis J. The Chinese Army today: tradition and transformation for the 21st century, p. 122. Routledge, 2006. As examples, in 1956, the Type 56 assault rifle was put into production, and the Type 64 pistol was designed and approved in 1964. 
People's Republic of China Chinese weapons and military vehicles are often, but not always, designated according to the Gregorian calendar, the one used by most nations. Two digits are used to designate the year. The two digits appear first, followed by the character shi, meaning "type".Blasko, Dennis J. The Chinese Army today: tradition and transformation for the 21st century, p. 122. Routledge, 2006. As examples, in 1956, the Type 56 assault rifle was put into production, and the Type 64 pistol was designed and approved in 1964. Republic of China (Taiwan) The Republic of China military uses a type designation system for domestically produced small arms, light weapons, and gun based artillery. The designation of the weapon, instead of using the literal word "type", is marked with a "T" with a subsequent number corresponding to the Republic of China year (民國; Minguo) the design was finalized or had its prototype completed. As an example, the domestic Type 65 assault rifle (65式步槍) is designated T65 and had its design finalized in 1976 (Minguo year 65). The T75 squad automatic weapon, based on the FN Minimi, had its prototype completed in 1986 (Minguo year 75) and designated as such; but was continuously improved and until the design was finalized in 1992. For weapons that are copied or produced under license, the Minguo year of which it is ready for production is used; as in the case of the T57, a copy of the M14 rifle.
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Republic of China (Taiwan) The Republic of China military uses a type designation system for domestically produced small arms, light weapons, and gun based artillery. The designation of the weapon, instead of using the literal word "type", is marked with a "T" with a subsequent number corresponding to the Republic of China year (民國; Minguo) the design was finalized or had its prototype completed. As an example, the domestic Type 65 assault rifle (65式步槍) is designated T65 and had its design finalized in 1976 (Minguo year 65). The T75 squad automatic weapon, based on the FN Minimi, had its prototype completed in 1986 (Minguo year 75) and designated as such; but was continuously improved and until the design was finalized in 1992. For weapons that are copied or produced under license, the Minguo year of which it is ready for production is used; as in the case of the T57, a copy of the M14 rifle.