K1
K1, K.I, K01, K 1 or K-1 can mean:
K1 main battle tank, a modern main battle tank of the South Korean military
K-1 cart a United States Signal Corps cart for carrying signal equipment
Daewoo K1, a carbine of the South Korean army
Fokker K.I, a World War I German experimental aircraft
HMS Acanthus (K01) / HNoMS Andenes (K01), a 1939 British, then Norwegian, Royal Navy Flower class corvette
K 1, a designation for a Swedish cavalry regiment
K1 class gunboat, planned World War II German gunboat
K1, another name for Masherbrum, a mountain in the Karakoram range in Pakistan
K-1 (Kansas highway), a state highway in Kansas
K1, a small town to north of Kirkuk city, Iraq
K1, an often used abbreviation of Keiichi Morisato's or Keiichi Maebara's first name (In the Japanese language 1 is "ichi")
denotes the first algebraic K-theory group of a ring 
.
Furness Railway K1, a steam locomotive related to the Furness Railway K2
GSR Class K1, a Great Southern Railway Irish steam locomotive
LNER Thompson/Peppercorn Class K1, a 1949 British 2-6-0 (mogul) steam locomotive
