There are multiple definitions:

1. flow diverter device(English)

   • for treatment of ruptured intracranial aneurysms
   • FRED, PED, SAH, FD
   • Vascular disease, Therapeutic approaches
   • https://doi.org…16.11.JNS161937
   • https://doi.org…017.3.FOCUS1732

2. frequency-division duplexing(English)

   • ZOD, ZSA, ZSD, 3GPP, 5G NR, ACLR, ACS, ASA, ASD, CLI, DL, DPD, FD, FTP3, gNB, gNB-RU, HD, IBFD, JCS, LNA, LOS, MCL, MCS, MIMO, PA, PSD, RB, RU, SBFD, SI, TDD, UE, UL, UMa, UPT
   • Communication, Signal analysis
   • https://doi.org…OC.2024.3419158