くノ一: a kunoichi (female ninja)

(literally) a precious metal / (inorganic chemistry) a noble metal

Kyūjitai form of 盗賊 (“thief; robber”).

traitor to the ruler

Ecuador (a country in South America)

mark, symbol, insignia / a trademark, service mark / (computing) short for マークアップ (mākuappu, “markup”)

Mark (given name) / (computing) Mach kernel

to mark, to put a mark (on something) / to set a record (to achieve or note the most extreme example of some variable, such as the highest score in a sport)

(organic chemistry) aromatic compounds

kunai technique