I always have trouble finding this information because the search keywords are so general they return too many hits of the wrong type. So here's my own version that I can hopefully find more easily.
Data Type Characters
The following table lists Visual Basic's type characters. For example, suppose you declare a variable using this code.
Then x is a Single.
I don't recommend using these type characters because I think they make the code harder to understand but it's nice to have this table so you can understand other people's code.
Literal Type Characters
You can use literal type characters to give a literal a specific type. For example, the following sets variable x equal to a Single value rather than the Integer which is the default for literal values with this format.
Dim x As Object = 10S
The following table lists the literal type characters.