The "people" icons represent an estimate of how many people worldwide visit a website.
The chart below provides an approximate estimate of how many US monthly users each of the "International People" represents.

"People"	Estimate monthly US users
0.5	1 to 500
1	501 to 1,500
1.5	1,501 to 5,000
2	5,001 to 20,000
2.5	20,001 to 40,000
3	40,001 to 90,000
3.5	90,001 to 400,000
4	400,000 to 1,000,000
4.5	1,000,001 to 12,000,000
5	12,000,001 to 130,000,000