The term 'PREFIX WITH DIRECTIONAL' refers to two prefixes, 'OMNI-' and 'uni-', which are used to indicate direction. The prefix 'OMNI-' is derived from the Latin word for 'all' and is used to describe something that is in all directions or covers all aspects. For example, an omnidirectional microphone is ONE that can pick up sound from all directions. The prefix 'uni-' is derived from the Latin word for 'ONE' and is used to describe something that is in ONE direction or covers ONE aspect. For example, a unidirectional microphone is ONE that can pick up sound from ONE direction.