An aglet is a device that secures each end of a shoelace and prevents it from fraying, making it easier to thread the shoelace through the holes in a shoe ("Tip of the Day").
The word aglet (or aiglet) comes from Old French aguillette (or aiguillette), which is the diminutive of aguille (or aiguille), meaning needle. This in turn comes from acus, Latin for needle. An aglet is like a small needle at the end of a cord.
In Phineas and Ferb, learning about aglets has the added benefits of:
- Fiancée accepting marriage proposal
- Getting job promotions
- Re-growing hair
- Gaining the ability to hear