Why hedgehog?
Depending on your scientific background one can select from the following options:
(i) It is one nucleon, represented as a Skyrmion, near the large nuclei (the apple).
(ii) It is an instanton near the nucleon (the apple)
(iii) It is the Stony Brook University near the Big Apple (New York City).
(iv) If none of it works for you: it is just a cute and curious creature