cross wire

Từ điển WordNet v3.1 - WordNet Dictionary

noun

either of two fine mutually perpendicular lines that cross in the focus plane of an optical instrument and are use for sighting or calibration
- he had the target in his cross hairs
• Syn:
cross hair
• Hypernyms:
line
• Part Holonyms:
reticle, reticule, graticule