OOI or Ooi may refer to:
*
Ocean Observatories Initiative
The Ocean Observatories Initiative (OOI) is a National Science Foundation, National Science Foundation (NSF)]Major Research Facilitycomposed of a network of science-driven Ocean observations, ocean observing platforms and sensors (ocean observato ...
, a National Science Foundation Division of Ocean Sciences program
*
Huang (surname)
Huang (; zh, t=Wiktionary:黃, 黃, s=wikt:黄, 黄, c=, p=, first=t) is a Chinese surname. While ''Huáng'' is the pinyin romanization of the word, it may also be romanized as Hwang (Korean surname), Hwang, Wong (surname), Wong, Waan, Wan, Waon ...
, a Chinese surname
*
Oosterhoff type I
A globular cluster is a spheroidal conglomeration of stars that is bound together by gravity, with a higher concentration of stars towards its center. It can contain anywhere from tens of thousands to many millions of member stars, all orbiting ...
(OoI), a category of
globular cluster
A globular cluster is a spheroidal conglomeration of stars that is bound together by gravity, with a higher concentration of stars towards its center. It can contain anywhere from tens of thousands to many millions of member stars, all orbiting ...
s
* In Japanese,
ōi is sometimes written as ooi
{{disambiguation