Icon with circular target with crosshairs or alignment marks and corner marks and centered lines and up-down arrows. Used in measurement calibration, alignment tools, precision control and equipment adjustment interfaces. Represents centering elements, detecting positions, locating objects, or aligning items to the middle. Indicates vertical movement, height adjustment, y-axis operations, plumb positioning, or longitudinal calibration procedures. Used in measurement calibration, alignment tools, precision control and equipment adjustment interfaces.