1. OOI - Adverb
2. OOI - Proper noun
OOI
(chiefly Internet slang) Initialism of out of interest.
Ooi (plural Oois)
(Malaysia, Singapore) A surname.
Last update: 06/06/2018 KUALA LUMPUR, June 6 (Bernama) -- National diver Ooi Tze Liang advanced to the semi-finals of the men's 3m springboard event at the 2018 FINA World Cup in Wuhan, China. Source: Internet
But the lines in the stars of Oosterhoff type I (OoI) cluster are not quite as weak as those in type II (OoII). Source: Internet