focal point

noun4

1. •
   A focus; a point at which rays of light or other radiation converge.
2. •
   The centre of any activity.

   • Swansea's attack lacked its focal point with top scorer Fernando Llorente injured, while Boro seldom looked like scoring their first away league goal of 2017. — 2017
3. •
   A feature that attracts particular attention.
4. •
   A solution that people will tend to use in the absence of communication, because it seems natural, special, or relevant.