solution; key to a solution
Refers to the method or way of solving a problem, especially in mathematics, puzzles, or logical challenges.
Please tell me the solution to this problem.
He easily explained the solution to the difficult math problem.
iconography; study of image contents
explicit method
Compound of 解 (kai, 'solve, untie') and 法 (hō, 'method, law'). The kanji combination directly conveys 'method of solving'.