火気(かき)

かき
noun
fire; open flame
formaldaily-life
1. fire; open flame; anything that can start a fire
Fire or sources of fire, such as lighters, stoves and cigarettes, especially on warning signs.
Open flames are strictly prohibited here.
The use of open flames indoors is prohibited.
At gas stations there is a risk of ignition, so you must not bring cigarettes or other sources of fire near.

Formal; seen mostly on signs and in safety rules.

Common collocations

Watch out

Many words read かき: 柿(かき) (persimmon), 牡蠣(かき) (oyster), 夏季(かき) (summer season), 下記(かき) (the following). 火気(かき) is the one on warning signs.