3U
3U or 3-U may refer to:
- Sichuan Airlines's IATA code
- A type of Rack unit
- Zerstörergeschwader 26, from its historic Geschwaderkennung code with the Luftwaffe in World War II
- A CubeSat measuring 30×10×10 cm
- The acronym for the third (3rd) catalog of Uhuru x-ray sources
See also
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