Definitions:
a blunt-ended surgical instrument used for exploring a wound or part of the body.

a thorough investigation into a crime or other matter

an unmanned exploratory spacecraft designed to transmit information about its environment.

a projecting device for engaging in a drogue, either on an aircraft for use in in-flight refuelling or on a spacecraft for use in docking with another craft.

physically explore or examine (something) with the hands or an instrument