Look up OOI in Wiktionary, the free dictionary.
OOI or Ooi may refer to:
- Ocean Observatories Initiative, a National Science Foundation Division of Ocean Sciences program
- Huang (surname), a Chinese surname
- Oosterhoff type I (OoI), a category of globular clusters
- In Japanese, ōi is sometimes written as ooi
This disambiguation page lists articles associated with the title Ooi.
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