Vanilla 1.1.9 is a product of Lussumo. More Information: Documentation, Community Support.
It's called "tail indent" :)
And it's the opposite of the head indent, i.e., the "right indent". You're right -- the term right indent is used much more than tail indent. We basically stuck to Apple terminology (if you google "tail indent", you'll find some developer documentation regarding indentation).
Please be aware that the tail indent needs to be set negatively, currently. So if you want a right indent of 2 cm (about 57 points), set it to -2 cm.
We just updated the Ulysses help to include a note regarding the different indentations. You can already view it in the online help and it will also be included in the next version of Ulysses.
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