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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
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<3 Awesome!
The term is used in distributions in science and statistics. It's used to describe your score on the SAT / GRE / GMAT for instance.
I figured this out by thinking of subtracting palindromic figures by hand.
12321
12321
00000
Each digit would yield the difference '0'. Somehow, it didn't occur to me until later on that if n1 - n2 == 0, n1 == n2. haha.