A pinprick is a tiny hole or mark made by something as small and sharp as a pin. If you've ever accidentally stuck yourself with a sewing pin, you've felt a pinprick: a quick, sharp sensation that's over almost instantly. The mark it leaves is so small you can barely see it.

The word also describes anything extremely small, especially when seen from far away. Stars might look like pinpricks of light in the night sky. A distant campfire across a dark valley might appear as just a pinprick of orange glow. When sailors spot land on the horizon after days at sea, it first appears as a pinprick on the endless blue.

People use pinprick metaphorically to describe minor annoyances or small attacks that don't cause serious harm individually but can add up. A single mosquito bite is just a pinprick of irritation, but dozens of them become genuinely bothersome. In historical contexts, military strategists sometimes describe small, repeated attacks on an enemy as pinprick raids: individually minor but collectively exhausting.

The word captures both the physical sensation of something small and sharp and the idea that tiny things can still matter, whether as beautiful specks of distant light or as small irritations that test your patience.