See base (of a triangle), pyramid.
See Solar Apex.
The first-formed end of a shell, which is usually pointed. The term is most commonly applied to gastropod (Gastropoda) shells.
Apex
- directional fabric
- directional filter
- directional relay
- directional selection
- directional solidification
- direction angles
- direction cosines
- direction fields
- direction finding
- direction keys
- direction of fit
- direction ratios
- direct isometry
- directive
- directive antenna
- directive of the European Union
- directivity
- directivity(symbol: D)
- direct labour
- directly proportional
- direct memory access
- direct method
- direct model
- direct motion
- direct neural interface