RDT

RDT can mean:

Radlett railway station, England; National Rail station code RDT
Random Drug Test
Rapidly exploring dense trees
Real Data Transport, a transport protocol
Registered Dental Technician
Registered Drama Therapist
Remote Digital Terminal
Remote desktop software, software or OS feature allowing applications to run remotely on a server
Relationship Defining Talk, a discussion among two or more people regarding the extent and nature of their relationship, romantic or otherwise.
Reliability Demonstration Test
Reliable Data Transfer
Resistance thermometers, also called Resistance Temperature Detectors
Rim driven thruster