Here is a paragraph from an article about "cloud computing":

The digital world loves to revel in its own jargon, and one of its most popular phrases today is "cloud computing." You see the expression everywhere new uses for the Internet are discussed. But what do techies and companies mean when they refer to doing things in "the cloud"? They aren't talking about meteorology, and all they see when they use the term -- which is always singular -- is sunshine, not rain.

What does "singular" mean in the last sentence?