In TeXForm#
TeXForm parses this entry as a character leaf mapped to U+03BE (GREEK SMALL LETTER XI).
\bbalpha\bbbeta\bbchi\bbdelta\bbDelta\bbdotlessi\bbdotlessj\bbepsilon\bbeta\bbgamma\bbGamma\txtbfbbxi
The ξ symbol (Greek small letter xi, U+03BE), written as \txtbfbbxi in LaTeX text mode.
TeXForm parses this entry as a character leaf mapped to U+03BE (GREEK SMALL LETTER XI).
\bbalpha\bbbeta\bbchi\bbdelta\bbDelta\bbdotlessi\bbdotlessj\bbepsilon\bbeta\bbgamma\bbGamma\txtbfbbxi