The word "计算" is formed through the combination of two semantically related characters, each contributing a core aspect of the final concept. The first character, "计" (jì), originally conveyed the idea of counting, reckoning, or planning, often with a nuance of verbal calculation or strategy. The second character, "算" (suàn), specifically denotes mathematical calculation, involving operations with numbers, historically associated with bamboo counting rods. When joined, they create a compound where "计" and "算" reinforce and complement each other, merging the notions of planning/reckoning and precise mathematical computation to form the comprehensive modern meaning of "to calculate" or "computation".