0-se - adde
- 0-series
- 3dB point
- a depository of development documents: ADDD
- a few
- a priori probability
- A* algorithm
- A-box
- A-carton
- A-monitoring
- A-period
- A-pins
- abacus
- abampere
- abbreviated address
- abbreviated address calling
- abbreviated answer
- abbreviated dialing number
- abbreviated dialing: ABD
- abbreviation
- ABC analysis
