Finder
WordNet
noun
(1) Optical device that helps a user to find the target of interest
(2) Someone who is the first to observe something
(3) Someone who comes upon something after searching
WiktionaryText
Noun
- One who finds, or discovers something.
- Finders keepers, losers weepers.
- An optical device, such as a viewfinder, used to locate a target or other object of interest