Transponder: This term may point to various concepts:
- A tracking device known as a transponder beacon
- Transponder signal , which helps pinpoint the location of starships
- A device for finding escape pods , called an escape pod transponder
- A masking transponder , a device used to hide a starship's location
- A radio transponder , a device used for communication purposes
- A tracking device, specifically a transponder beacon
- A navigational tool found in asteroid belts called a transponder buoy
- A hyperspace transponder , which is used for message transmission
- The transponder code , or IFF code, which identifies starships
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