punctum

noun3

1. •
   A sharp tip of any part of the anatomy; a point or other small area.

   • Thus, from what has been stated, we see that neither the white puncta nor the minute white branchwork of lines were ever tubular. — 1861
2. •
   A detail in a photograph that captures the viewer's attention and evokes an emotional response or personal connection beyond the intended subject.
3. •
   A neume representing a single tone.