What are numbers with E in them called?

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I know that this is a very stupid question, and that I will get flamed for it, but I cannot find any information what-so-ever about it on the internet, because Google doesn't include some characters while querying.

What is a number with E in it called?

Ex: 41E+100

I understand that this is 41 followed by 100 zeros, but what is this type of notation called?