google - images - "riprap"
Can be used in a lot of ways as mentioned - can terrace or just a large batter, infill with vegetation etc. Could even make a waterfall etc if you want.
I originally did a search for the battery but couldn't find any relevant images...
but did a search for riprap like you sugested and voila!!! Thanks Keen.....
for those that don't know found this good image
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