Slenderness ratio
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In architecture, the slenderness ratio, or simply slenderness, is an aspect ratio, the quotient between the height and the width of a building.
111 West 57th Street in Midtown Manhattan is the world's most slender skyscraper.
432 Park Avenue
Pencil tower
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A pencil tower is a high-rise building or skyscraper with a very high slenderness ratio, meaning it is very tall while being very thin. There is no universal definition of how slender these buildings
Slenderness ratio
…the building or diverse types of tuned mass dampers to avoid unwanted swinging. Tall buildings with high slenderness ratio are sometimes referred to as pencil towers. The Super Slender Revolution…
432 Park Avenue (middle), a pencil tower in New York City
Maxluck Court (left) and Fook Kee Court (brown) are examples of typical pencil towers in Mid-Levels, Hong Kong
The Summit (left) and Highcliff (right) in Hong Kong
One Madison, Manhattan