•
Old Pension Scheme, a pension scheme in India •
Online portfolio selection portfolio management for
Stock market •
O. Panneerselvam, former chief minister of Tamil Nadu, India •
Optical position sensor, a position sensitive device •
Optical Pooled Screening, a scientific research method •
Off-premises station, a telephone extension located off-site •
On-base plus slugging, a baseball statistic •
Open Pluggable Specification •
Oriented polystyrene •
Orthogonal polarization spectral imaging •
Open Publication Structure, a specification for e-books in
EPUB format •
OPS-301, Operationen- und Prozedurenschlüssel, German healthcare procedure classification •
Orange Pekoe Superior, a
tea leaf grade ==See also==