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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.
Get started now by creating a new collection.
It's a strange hack that allows you to get an array of a particular size with nothing in each space, then "join" all the nothings together with the character you're actually interested in. So, if you "join" such an array of size 4 that you create this way with "*", you'll get "***".