The 2 sigma comes from two standard deviation, sigma, the symbol for standard deviation.

2 sigma 来自两个均方差，sigma 是均方差符号。

So this is the capital Greek letter sigma right over here, it's shorthand math, math shorthand for sum.

这是大写希腊字母，它是数学中总和简写。

This could apply to females as well, of course, called the 'sigma female'.

这也适用于，当然，被称为“西格”。

When I started this channel I made a highly criticized video about an idea called the sigma male.

当我开始这个频道时，我制作了一个备受批评视频，讲述了一个叫做西格男想法。

Four sigma is like one in 10,000 chance that it's just noise that created this correlation across the pulsars.

“4 西格”指是“噪声是造成脉冲星之间相关因”几率为万分之一。

So sigma is kind of the Greek-letter equivalent of s.

所以 sigma 是 s 希腊字母等价物。

And that's the same thing as sigma squared of y.

这与 y 平方西格是一样。

And a long string of sequential terms added together is collapsed into a capital sigma.

一长串连续项加在一起被折叠成一个大写西格。

But the sigma right here, that is just the standard deviation of the distribution.

但是这里 sigma 只是分布标准偏差。

This straightforward sort of bond is called a sigma bond.

这种简单债券称为 sigma 债券。

So you take the sum-- that's that big sigma is for-- of each of the data points.

所以你对每个数据点求和——这就是大西格作用。

As they come together for the bond, the sigma bonds will occur between the hybridized orbitals.

当它们聚在一起形成键时， σ键将出现在杂化轨道之间。

Double bonds consist of a sigma bond and a pi bond.

双键由西格键和π键组成。

The sp orbital, the one that forms the sigma bonds here, is linear.

在这里形成西格键 sp 轨道是线。

That pi bond bridges the sigma bond, locking it in place.

那个 pi 键桥接 sigma 键，将它锁定到位。

And if you've done the calculus playlists already, sigma notation is really like a discrete integral on some level.

如果你已经完成了微积分播放列表，sigma 符号在某种程度上真就像一个离散积分。

According to this idea, the sigma male does not identify with a specific place in the hierarchy, or with a group for that matter.

根据这个想法，西格男不认同等级制度中特定位置，或者就此而言，不认同一个群体。

The variance of a population-- and it's this Greek letter, sigma.

总体方差——就是这个希腊字母 sigma。

And now we're just going to do some algebra, some sigma algebra I guess you could call it.

现在我们要做一些代数，一些 sigma 代数，我想你可以称之为。

We've been dealing with these sigma notation variables and all that so far.

到目前为止，我们一直在处理这些 sigma 符号变量等等。