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σ (EN)
字母,符号

字母 “σ”

σ, sigma
  1. 希腊字母表的第十八个字母,小写的σ。
    In Greek language classes, students learn that σ is the lowercase form of sigma.

符号 “σ”

σ
  1. (数学)表示统计学中标准差的符号
    The statistician calculated σ to understand how the data varied from the mean.
  2. (物理)表示电导率的符号
    The electrical conductivity σ increases with temperature in this material.
  3. (物理)表示横截面积的符号
    The scattering cross-section σ is crucial in nuclear physics experiments.