azimuth aiming circle head

declination aiming circle (declinated aiming circle)

aiming circle

periscopic aiming circle

aiming circle monocular

artillery aiming circle

kill circle / aiming reticle

azimuth circle

aiming dot; aiming mark; crosshair; crosswires; pointing mark; telescope laying mark

aiming lamp / aiming light

aiming post lamp / aiming post light

azimuth-scale index / azimuth scale index

penetrating head injury / open head injury

drop head body (drop-head body)

head-to-head flyoff

infrared homing head (IR homing head)

horizontal circle clamp

killing circle

circle

danger circle

elevation circle

paraselenic circle

parhelic circle

antarctic circle

circle of position

great circle course

great circle distance

great circle heading

great circle route

polar circle

primary great circle spherical coordinate system

calibration circle

great-circle range