The sharpest-pointiest thing in the world is a topic that can vary depending on different perspectives and criteria. However, one example often cited as being incredibly sharp is a carbon nanotube (CNT).
Carbon nanotubes are microscopic cylindrical structures made of carbon atoms arranged in a unique lattice pattern. They have a diameter on the nanometer scale and can be incredibly long. The individual carbon atoms in a nanotube are bonded in a way that creates an exceptionally sharp tip, often described as having atomic precision.
Due to their structure, carbon nanotubes have remarkable mechanical strength and hardness. While they are incredibly sharp at the nanoscale, it's important to note that they are not easily visible to the naked eye and require powerful microscopes to observe them.
It's worth mentioning that other substances or materials, such as certain types of specialized needles or atomic-scale tips used in scanning probe microscopes, could also be considered sharp-pointed objects. However, the precise definition and measurement of "sharpness" can vary, so the sharpest-pointiest thing may be subject to interpretation based on different criteria and contexts.