focal

1. An object that is used to focus concentration when performing magic.
2. The individual who is the focus of a study or review, when the study or review is based on that individual's interactions with others.
3. A representative of a group or class of people within an organizational system.
4. A sign or similar type of marketing material designed to draw attention to special deals.
5. The central or most important element of something; a focal element.
6. A major point of interest; an attraction.
7. An exemplar of a concept.

Plural focals