What is sn?

SN may refer to several things, most commonly:

  • Silicon Nitride: A chemical compound with the formula Si₃N₄. It is a hard, relatively inert ceramic material used in a variety of applications.

  • Serial Number (SN): A unique identifier assigned incrementally or sequentially to an item, to uniquely identify it.

  • Signal-to-Noise Ratio (SNR or S/N): A measure used in science and engineering that compares the level of a desired signal to the level of background noise. It's often used in contexts like audio, video, and communication systems.

  • Sweden (ISO 3166-1 alpha-2 code: SN): The country of Sweden, especially in the context of country codes.

  • Sino-Nasal (SN): Relating to the sinuses and nasal passages.