These are three types of tread or string held together by three different metal aglets.
THis right here is a picture of the classic nike aglet, one of the most recognized aglets in the world.
THis is a picture of wierd aglets, but it shows that not all aglets are used for shoelaces.
These are possibly the coolest aglets I've ever seen, (FYI) those are the definition of B.A.
These aglets show that