cross hair

noun Usually, cross hairs.
1.
Also called cross wire. one of the fine wires or fibers, strands of spider web, or the like, crossing in a focal plane of an optical instrument to center a target or object or to define a line of sight.
2.
one of the marks that aid in the positioning of overlaying images for correct registration in printing. Compare register ( def 11b ).
Also, crosshair.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
cross hairs
 
pl n
Also called: cross wires two fine mutually perpendicular lines or wires that cross in the focal plane of a theodolite, gunsight, or other optical instrument and are used to define the line of sight

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
The second levels the instrument and reads the height where the cross hairs show on the rod.
Use these cross hairs as your cursor to highlight the text to be linked.
When the cursor is moved off of a view, the cross hairs are parked at the negative global origin.
Additional value added features include daily color tide graphs with cross hairs indicators.
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