The size of the arrow doesn't represent anything, it's the way it points.
Foot size does not represent a persons height.
An Arrow can be used to represent a vector by having the direction of the arrow indicate the direction of the vector and the size or length of the arrow represent the size of the vector.
Sample size
It is approx 105/5189.
Predateing
size and shape specifiers
No, the height of an NBA player in relationship to his shoe size does not represent a negative correlation. The two actually represent a positive correlation. As the NBA player increases in size, so will his shoe size.
An Arrow can be used to represent a vector by having the direction of the arrow indicate the direction of the vector and the size or length of the arrow represent the size of the vector.
5.7L
This is used to represent the relative size of the components.
Size of earth in miles around equator.