In TeXForm#
TeXForm parses this entry as a character leaf mapped to U+03BF (GREEK SMALL LETTER OMICRON).
\bbalpha\bbbeta\bbchi\bbdelta\bbDelta\bbdotlessi\bbdotlessj\bbepsilon\bbeta\bbgamma\bbGamma\bfbblambda
\bfbblambdaSymbol
The οBB symbol (Greek small letter omicron, U+03BF), written as \bfbblambda in LaTeX math mode.