In TeXForm#
TeXForm parses this entry as a character leaf mapped to U+03B9 (GREEK SMALL LETTER IOTA).
\bbalpha\bbbeta\bbchi\bbdelta\bbDelta\bbdotlessi\bbdotlessj\bbepsilon\bbeta\bbgamma\bbGamma\txtbfbbiota
\txtbfbbiotaSymbol
The ι symbol (Greek small letter iota, U+03B9), written as \txtbfbbiota in LaTeX text mode.