Beacon

Beacons are columns of light in SS undefined and.

Skyward Sword
In SS undefined, when Link places a Beacon on his Map, either on The Surface or The Sky, a blue column of light will appear, acting as a waypoint to reach the desired location. Beacons can only be placed on Overworld Maps by pressing the C Button.

The power to place Beacons is only activated after Link first talks to the aged Impa in the Sealed Temple, at which point only one Beacon can be placed at a time. Once Link reaches the northern portion of the Lanayru Desert where the entrance to the Lanayru Mining Facility is located, Fi will enable the ability to place up to five Beacons on the map.

The Sacred Tears also emit Beacons when Link collects a Light Fruit or when he is being chased by a Guardian in the Silent Realms.

Breath of the Wild
In, Beacons can be placed while on the Map or by using the Scope. Up to five of them can be placed at a time, appearing in red, blue, yellow, green, and purple. When a Beacon is placed, it will be shown on the minimap at all times. They can also be seen as columns of light while using the Scope. Beacons can be replaced with any stamp while on the Map.