Again, so as we don't get confused, normally we use S for strategy, but let's use P since they're prices.

为了避免混淆,通常我们用S表示策略,但是这次我们使用P,因为它代表价格

耶鲁公开课 - 博弈论课程节选

Notation: so I'm going to use little "si" to be a particular strategy of Player i.

表述法,我们用小写si来表示参与人i的某个策略

耶鲁公开课 - 博弈论课程节选

While we're here, our third notation for strategy, I'm going to use little "s" without an "i," no subscripts: little "s" without an "i," to mean a particular play of the game.

说到这,我们来定义第三个标记符,我们用不带下标的小写s,来表示某一次博弈

耶鲁公开课 - 博弈论课程节选