piipohjia
Piipohjia is a Finnish term that literally translates to "pipe bottoms." It most commonly refers to the small, often burnt or charred remnants of wood that are found at the bottom of a traditional Finnish sauna stove, known as a kiuas. These remnants are a natural byproduct of burning wood in the kiuas, which is used to heat the sauna stones.
The presence of piipohjia indicates that the stove has been used and has heated up sufficiently. Sauna