This is because most fraternities and sororities are named after a series of Greek letters, such as Alpha Delta Pi or Sigma Phi.

VOA: special.2009.09.25

You chose Alpha; I'm assuming these were roughly your payoffs, more or less, you were caring about your grades.

你选择的是α,我想这差不多就是你的收益了吧,你关注自己的成绩

耶鲁公开课 - 博弈论课程节选

Without showing your neighbor what you are doing, put it in the box below either the letter Alpha or the letter Beta.

在不被你同桌看到的情况下,在方框中填写字母α或者字母β

耶鲁公开课 - 博弈论课程节选

Just write down an Alpha or Beta: what you're going to do here.

就写α或者β就行,就是你的选择

耶鲁公开课 - 博弈论课程节选

We had acknowledged that Alpha is a dominant strategy for my opponent so we must choose based upon, or knowing that my partner is going to choose Alpha.

我们发现了α是我们对手的优势策略,所以我们必须要根据,我对手会选α来做出选择

耶鲁公开课 - 博弈论课程节选

Now, it turns out that this game, this Prisoner's Dilemma, with the Alpha's and Beta's, or essentially the same game, has been played many, many, many times in experiments.

实际上,囚徒困境这个博弈,比如选择α和β,或者类似的博弈,在现实中进行过很多次实验

耶鲁公开课 - 博弈论课程节选

So one or two Beta's, mostly Alpha's.

只有一两个β,基本都是选α的

耶鲁公开课 - 博弈论课程节选