- noun a series of fine lines in an optical instrument such as a telescope, used for measuring
- noun the network of lines formed by the meridians and parallels of longitude and latitude of the earth on a flat sheet of paper
- A grid pattern on a screen of a device such as an oscilloscope, which serves to quantify the displayed information. Such a scale may be a part of the inner surface of the screen, drawn on the screen, placed in front of the screen, or generated electronically.
- noun one of a number of fine lines visible in the lens of an optical instrument, used as an aid to measuring distance or sighting objects