How about three things that are infinite. Counted number are infinite. The complete statement of PI is infinite. The result of 1 divided by 3 is infinite.
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There is no such thing as greatest common multiple because there is an infinite amount of multiples for any number in the world.
Apeirogon. But some says Circle.
Countably infinite means you can set up a one-to-one correspondence between the set in question and the set of natural numbers. It can be shown that no such relationship can be established between the set of real numbers and the natural numbers, thus the set of real numbers is not "countable", but it is infinite.
In math yes. Numbers are infinite.
Still infinite. Specifically, you won't get a larger infinity by adding two infinite numbers, or even by multiplying them. However, if you raise 2 to an infinite power, you do get a larger infinity. For more details, search the Wikipedia, or Google, for Aleph zero, or for aleph number.