Probably a forgotten feature from the beginning of Wikia. Heading 6 is not listed when you edit using rich text (the regular editing) but you can use it by putting in the code when in source mode. In source mode to make a heading you put = signs in front of it. 2 equal signs on either side of the text will make it Heading two. 3 will make it Heading 3. If you put 6 equal signs on either side of the text it makes a super small text. It's about half the size of Normal. Here is what it looks like:

Headline 6

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