cross_hair
1. [ 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
Synonyms: cross_wire
Examples:

"he had the target in his cross hairs"

Related terms: line reticle
Similar spelling:   crosshairs
  cross_wire
  crossroad
  cross-grained
  crossword
  crossruff
  crossroads