NASA Abbreviations and Acronyms

1. TD
   Time Delay
2. TD
   Touchdown
3. TD
   Temporary Duty
4. TD
   Touch Down
5. TD
   Terminal Distributor
6. TD
   Technical Directive
7. TD&SA
   Telephone
8. TDB
   Time Duration of Burn
9. TDB
   To Be Determined
10. TDD
    Technical Description Document
11. TDD
    Task Description Document
12. TDF
    Test Data Folder
13. TDM
    Time Division Multiplexing
14. TDM
    Time-division Multiplexing (multiplexer)
15. TDP
    Temperature and Dewpoint
16. TDR
    Test Discrepancy Report
17. TDR
    Tracking Discrepancy Report
18. TDRR
    Test Data Recording and Retrieval
19. TDRS
    Tracking and Data Relay Satellite
20. TDRS
    Telemetry Downlist Receiving Site

Last updated: May 6, 2025 — Total entries: 14,020