One who explores something
A person who by means of travel (notably an expedition) searches out new information.
A visual representation of a file system etc. through which the user can navigate.
Any of various hand tools, with sharp points, used in dentistry.
A person, principle, or thing which acts as a guide; a guiding light; also, something which attracts much attention; a centre of attention.
The star visible to the naked eye which was in the past, is now, or will be in the future nearest a celestial pole of a planet.