peculiarity

[1]	idiosyncrasy , distinctive feature , distinguishing characteristic , oddity , eccentricity , abnormality , irregularity , quirk , kink , crotchet , caprice
[2]	feature , specialness , specialty , characteristic , property , speciality , distinctiveness , quality , trait , attribute , earmark , hallmark , mark , particularity , singularity , (Brit) speciality , (US) specialty
[3]	curio , curiosity , oddity , oddment , rarity