#watchmaking

• Notch — A specialized technical term designating a notch, groove, or recess deliberately made on the edge of a mechanical part or a dial to allow the exact jointing, guiding, or locking of another structural element. In fine horology, the term describes the precise cutout where cases, protective crystals, or mobile escapement components are secured.
• Small spring — Diminutive of the noun 'arc' (spring/bow); a small-sized mechanical component made of steel or elastic material, structurally utilized in various fine mechanisms (watchmaking, locks, valves) to exert a pressing, returning, or shock-absorbing force. In anatomy and biology, the term can describe minuscule curved structures or concave anatomical profiles.
• Small spring — A diminutive for a bow or spring; a very small metallic spring structurally utilized in precision mechanics, watchmaking, locksmithing, or electronic devices to ensure the return of a component to its original position via detensioning. In a musical sense, the term describes a miniature bow used either as a decorative accessory or for toy stringed instruments designed for children.