open operations (of a ninja)
Refers to ninja activities conducted openly, in contrast to 陰忍 (いんにん) which denotes covert operations. This is a specialized historical term.
See also: 陰忍
Yōnin is a type of ninjutsu that deceives the enemy through overt activities.
Ninjas sometimes disguised themselves as merchants as part of yōnin to gather information.