The "kissing number" refers to the maximum number of non-overlapping spheres that can simultaneously touch another sphere of the same size in a given dimensional space. The concept can be applied in multiple dimensions, and the kissing number varies depending on the dimension. Here are some known kissing numbers: 1. **In 1 dimension**: The kissing number is **2**. A line segment (sphere in 1D) can touch two other line segments at its endpoints.

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