1. [Structured TeXt] - a generic name for the class of markup languages like those used when editing this Wiki (see [Formatting rules]). 

   2. [ASCII] control character, Start of TeXt (This is not a commonly used acronym - try doing the same to [RS] aka Record Separator)

[CMcC] explained in the [Tcl chatroom]:	"There are a lot of variants on STX, and there'll be a lot more, but they all share a couple of characteristics (e.g. significant blank lines, leading space for indenting, *, etc). Some people from Python are trying to come up with a canonical STX.  I'm tracking their work, and adapting it."
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The language used in editing [TIP]s is also a variant of STX.
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[RS] earlier made up the name "WikiML", which he thought might be a bit more intuitive... See [Wiki format to HTML] for a simple converter.
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http://docutils.sourceforge.net/spec/rst/introduction.html has some good thinking about the subject, courtesy of Python.  I don't necessarily agree with their outcomes, but they're working toward a formal definition of the language, which IMHO is a good thing. - [CMcC]

http://www.zope.org/Documentation/Articles/STX here's another good intro to the general concept.
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I've written a pretty slick implementation of a wiki-like Structured Text translator, here [http://chinix.com/~colin/stx/] - [CMcC] 22Apr2005
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[Category Acronym]