X28
X28 may refer to:
- X.28, ITU-T standard specifying the interface between asynchronous character-mode data terminal equipment (DTE), such as computer terminals, and a Packet Assembler/Disassembler (PAD) that connects the DTE to a packet switched network such as an X.25 network
- X-28 or Osprey Osprey I, a single-seat flying boat
- X28 (New York City bus)
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