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π (EN)
字母,符号

字母 “π”

π, pi
  1. 希腊字母表中的第十六个字母
    The teacher wrote a π on the blackboard.

符号 “π”

π
  1. (数学)数学常数π,约等于3.1416,等于圆的周长与直径之比。
    In our geometry lesson, we calculated the circumference of circles using π.
  2. (物理)一种称为介子的粒子,称为π介子。
    Physicists observed the decay of the π meson during the experiment.
  3. (数学)在代数拓扑中用于表示同伦群的符号。
    The topologist explained how π₁ measures the fundamental group of a space.
  4. (数学)素数计数函数,表示小于或等于给定数的素数的数量。
    Mathematicians study the behavior of π(n), the prime-counting function.
  5. (语音学)在某些音标中代表浊双唇吸气音辅音的符号。
    In phonetic transcription, π is sometimes used to represent a labial click sound.