apex

Roman Latin had a delightfully slippery habit of turning a physical object into a metaphor. An apex was not just a summit or tip; it could also be the little rod perched on a priest’s cap, a tiny thing that made the whole ceremonial silhouette feel complete. That same Latin word later fed English uses for the top of a building, the crest of success, and even the sharp point of a cone. The root may be tied to Latin apere, “to fasten,” or to a deeper Indo-European idea of reaching or grasping, though scholars leave a little room for doubt. And that’s the fun of it: apex is the word that sits at the top while still hinting at something pinned in place, like a mountain wearing a hat.