V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

STX
       Streaming Transformations for XML (XML)


V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

STX
       Start of TeXt


The Free On-line Dictionary of Computing (30 December 2018):

Start Of Text
STX

    (STX) Mnemonic for ASCII 2.

   (1996-05-31)