Binary describes a number with a base of two.
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The word two is an adjective because it describes an amount of items/nouns. 'There were two cats sleeping by my doorstep.' In this sentence, (as an example) two is describing the number of cats there are by the doorstep.
An isosceles triangle
The base two is binary. That's where bi- comes from.
You can have an infinite number of different exponents on a base number, you would then have an infinite amount of different numbers.
Lateral surface :)