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- order statistics
- ordered pair
- ordered set
- ordered tree
- ordering relation
- ordinary differential equations
- organizational information system
- OROM
- orthogonal analysis
- orthogonal equations
- orthogonal functions
- orthogonal list
- orthogonal matrix
- orthogonal memory
- orthogonal term rewriting system
- orthonormal analysis
- orthonormal basis
- orthonormal functions
- oscillation sort
- OSF