The word "站立" is formed by combining two characters that both convey the meaning of standing: "站" is a phono-semantic character where the radical "立" (meaning stand) provides the semantic component related to standing, and "占" offers phonetic guidance, while "立" itself is a pictograph representing a person standing on a surface. Together, they form a compound word where each character reinforces the other to explicitly denote the action of standing upright.