The term "flexion" and its variants have appeared in literature with a dual character, reflecting both physical movement and mental activity. In anatomical and mechanical texts, "flexion" denotes the bending motion of limbs or body parts—for example, in the description of the "flexion of the lower limbs" ([1]) and in discussions of bodily functions involving both flexion and extension ([2]). Meanwhile, its cognate "réflexion" in French literature has long been used metaphorically to signify the process of thought, meditation, or deliberate calculation, as found in several passages that depict actions of thoughtful deliberation or calculated reasoning ([3], [4], [5], [6], [7], [8], [9]). This dichotomy reflects the word’s evolution, where physical and mental dynamics converge in its usage across different literary and historical contexts.