What does ROI stand for?

Member of the Royal Institute of Oil Painters - British

Radiological Operating Instructions - Environmental science (COE)

Radio, Optical, Inertial

Radius of Influence - A distance at the subsurface vacuum (IDEM)

Range Operating Instructions (SAUS)

Range Operational Instructions (SAUS)

Range Operations Instruction - NASA (KSC)

Rate of Injection - Automotive fuel systems

Rate on Investment (SAUS)

Reach-Out International - Association (EA)

Reactive Oxygen Intermediate - Biochemistry

Read-Only Instruction (SAUS)

Recessed-Oxide Isolation (SAUS)

Rectangle of Interest (SAUS)

Region of Influence

Region of Interest - Nuclear energy (NRCH)

Registration of Interest

Relevant, Original, Impact - Advertising (WDMC)

Reliability Organization Instruction (AAG)

Religious Observance Index (BJA)

Remnant of Israel (EA)

Rendezvous Orbit Insertion - Aerospace

Report of Investigation - Military (AFM)

Research On Line International (IID)

Research Online International, Inc. - Information service or system (IID)

Resource Objectives, Inc. - Ridgewood, NJ (TSSD)

Resources Objectives, Inc. (SAUS)

Return of Investment (SAUS)

Return on Investment - Finance

Rock Island Armory - NCIC firearms make code (NCIC)

Rotating Optical Interferometer

Royal Institute of Oil Painters - British

Royal Institute of Oil Painters, London - 1883 (NGC)

Return on Investment (WDMC)