In the context of a micrometer or measuring device, the term "anvil" refers to a fixed or stationary component against which the object being measured is placed. The anvil provides a reference point for accurate and consistent measurements. In a micrometer, for example, the anvil is typically a flat surface or a cylindrical extension that protrudes from the frame and serves as the point of contact for the measured object. The anvil, along with the spindle or movable component, allows precise measurements to be taken by adjusting the position of the spindle and reading the corresponding measurement value on the micrometer scale.