Meanings

attributing a sequence number (packet, message, etc.)

space exploration

cybersleuth

sonar

oil exploration

house hunting

probe (device; electric, magnetic, sonic, etc.)

detective team

in search of

to seek a path

detective agency

job hunting

to be suspected without cause

planetary exploration

drug-sniffing dog

trial by hot water

treasure hunting

ultrasonic test equipment

ultrasonic test instrument

scanning surface