the sixteenth letter of the Greek alphabet (Π, π), transliterated as ‘p’ 希腊字母表中第十六个字母(译写为p) Greek ■the numerical value of the ratio of the circumference of a circle to its diameter (approximately 3.14159) 圆周率 ■(Pi)[followed by Latin genitive](Astronomy)the sixteenth star in a constellation (天文)π星(星座中第十六颗星) Pi Herculis. 武仙座π星。 ■(Chemistry & Physics)relating to or denoting an electron or orbital with one unit of angular momentum about an internuclear axis (化,物理)(具有一个核间轴角动量单位的)电子,轨函数
symbol for
■(π)the numerical value of pi 圆周率值 ■(Π)osmotic pressure 渗透压力 ■(Π)mathematical product 乘积
语源
Greek
pi2 [pʌɪ] adjective
(Brit. informal). short for pious (英,非正式)。 pious 的简称