- parallelogram
- parallelogram axiom
- parallelogram identity
- parallelogram illusion
- parallelogram law
- parallelogram linkage
- parallelogrammatic number
- parallelogram of periods
- parallelogram polyomino
- parallelogram rule
- parallelohedron
- parallelologic triangle
- parallelometer
- parallel operating system
- parallel operation
- parallel operation environment
- parallel operation environment, POE
- parallelopiped
- parallel optical interface
- parallel optimization
- paralleloscope
- parallelotope
- parallel-packing-chain crystal
- parallel pair
- parallel perspective