SACLOS is an acronym for Semi-Automatic Command to Line of Sight, a method of missile guidance. In SACLOS, the operator has to continually point a sighting device at the target while the missile is in flight. Electronics in the sighting device and/or the missile then guide it to the target.
SACLOS devices commonly work using one of two methods: either wire and radio-guided, or beam-riding.
Read more about SACLOS: Wire and Radio-guided SACLOS, Beam-riding SACLOS