Roi

"Roi" in Polish

RI

(Republic of Ireland)

ROI

(return on investment — see also return on investment)

ROI

(region of interest (in digital images, microscopy: in 3-dim-specimen reconstructions by consecutive sectioning))

ROI

(region of interest (military, espionage))

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.