You may encounter (or create) waypoint markers. These are temporary markers in the 3D world which server to highlight some important place or objective that a user should move towards. Permanent markers may appear if they are required as part of some scripted event.
A waypoint comes with a distance counter, and appears through walls and other obstacles.
In order to create a waypoint object yourself, select your laser by pressing L and then click the mouse-wheel once you have placed your pointer over the objective. Other avatars cannot be objectives.
Below we show several waypoints placed at the same time. User created waypoints with self-delete after 5 seconds.