What do others mean when they say umbrella? Does anyone else have an umbrella?

It is estimated that this "umbrella" comes from a joke. The story goes like this: A student wrote to his parents because he did not have an umbrella: "All my classmates are alive, but I am not. Please Please send money quickly so that I can buy my life." He wrote "umbrella" as "life".

Either the umbrella can protect you from the wind and rain, which leads to the "background".