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