(countable) A male given name from Scottish Gaelic. / A surname from Anglo-Norman. / A surname from Old French. / A surname from Scottish Gaelic. / A surname from Bengali.

(obsolete, formal) A king.

(obsolete) Royal.

(advertising) Initialism of run of year.

(accounting) Initialism of return on investment. / (photography) Initialism of region of interest (in digital images). / (military, espionage) Initialism of region of interest.

Initialism of Republic of Ireland.

Initialism of Republic of Ireland.

plural of roy

Roi islet, Kwajalein atoll, Marshall Islands.

plural of ROI