The ngultrum (/əŋˈɡʌltrəm/; Dzongkha: དངུལ་ཀྲམ [ŋýˈʈúm], symbol: Nu., code: BTN) is the currency of the Kingdom of Bhutan. It can be literally translated as ‘silver‘ for ngul and ‘coin’ for trum. It is subdivided into 100 chhertum (Dzongkha: ཕྱེད་ཏམ [pt͡ɕʰɛ́ˈtám], spelled as chetrums on coins until 1979). The Royal Monetary Authority of Bhutan, the central bank of Bhutan is the minting authority of the ngultrum banknotes and coins. The ngultrum is currently pegged to the Indian rupee at parity.
BTN Coins
In 1974, aluminum Ch.5 and Ch.10, aluminium-bronze Ch.20, and cupro-nickel Ch.25 and Nu.1 were introduced. The Ch.5 was square and the Ch.10 was scallop-shaped. A new coinage was introduced in 1979, consisting of bronze Ch.5 and Ch.10, and cupro-nickel Ch.25 and Ch.50 and Nu.1 and Nu.3. Aluminium-bronze Ch.25 was also issued dated 1979. Ch.5 and Ch.10 have largely ceased circulating. Currently, coins are available in denominations of Ch.20, Ch.25, Ch.50 and Nu.1.
BTN Banknotes
On June 2, 1974, Nu.1, Nu.5 and Nu.10 notes were introduced by the Royal Government of Bhutan, followed by Nu.2, Nu.20, Nu.50, and Nu.100 in 1978.[8] On August 4, 1982, the Royal Monetary Authority of Bhutan Act was enacted, although the RMA did not begin operations until November 1, 1983, and did not issue its own family of notes until 1986.
BTN Present series
In 2006, the Monetary Authority introduced its latest series of notes, with denominations of Nu.1, Nu.5, Nu.10, Nu.20, Nu.50, Nu.100, Nu.500, and Nu.1000. These notes use a hybrid substrate.