rarity

[1]	rareness , curiosity , oddity , infrequency , curio , collector's item , find , treasure , conversation piece , (Brit) one-off , (Colloq) (Brit) oner
[2]	unusualness , tenuity , low density , uncommonness , rareness , uniqueness , scarcity
[3]	curio , curiosity , oddity , oddment , peculiarity