Noun- A Heba Onix is a perfect female specimen. Often the scale for basing human attractiveness is based on a scale of one to ten. Ten being the highest and best looking. Few females have achieved the 10 status, but when deciding on an atractiveness level, Heba Onix is the person that defines the 10 and all other subjects are based on. Heba Onix and "10" sometimes become interchangable in this respect.
Question- On a scale of one to Heba Onix, how good looking was she?
Answer- She was pretty darn attractive, but in comparison to Heba Onix, I would have to say she's a four.