Ward called this "hiding the gibberish", new term for me as a non native speaker. To explain this tag to someone you could say "This is the gibberish tag" - If people see this they can safely skipp it, but instead of seeing that huge "gibberish" code that they don't understand, they just see this.
I like the word "gibberish" (or "native") far more than I like the world "Placeholder". The word "placeholder" implies that the markup is not in mixed mode, but rather in creole mode.
I think we might want to invent a better name. I suggest "WikiSpeck" - as in a "smudge". It's also a bad non-native English speaker pun on the word "WikiSpeak"...
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