That is short for Origins-Spectral Interpretation-Resource Identification-Security-Regolith Explorer.

VOA: special.2011.06.22

And hydrogen atom is what we're learning about, so that's the most relevant here. But just to show you that each atom does have its own set of spectral lines, just for fun we'll look at neon also so you can have a comparison point.

为了给你们展示下每个原子，都有自己的一套谱线,仅仅是为了好玩，我们看下氖,你们可以比较一下。

麻省理工公开课 - 化学原理课程节选