In TeXForm#
TeXForm parses this entry as a character leaf mapped to U+2126 (OHM SIGN).
\bbalpha\bbbeta\bbchi\bbdelta\bbDelta\bbdotlessi\bbdotlessj\bbepsilon\bbeta\bbgamma\bbGamma\txtbbOmega
\txtbbOmegaSymbol
The Ω symbol (Ohm sign, U+2126), written as \txtbbOmega in LaTeX text mode.