ag·let 
(ăglĭt)
(ăglĭt)n.
1. A tag or sheath, as of plastic, on the end of a lace, cord, or ribbon to facilitate its passing through eyelet holes.
2. A similar device used for an ornament.
[Middle English, from Old French aguillette, diminutive of aguille, needle, from Vulgar Latin *acūcula, from Late Latin acucula, diminutive of Latin acus, needle; see ak- in the Appendix of Indo-European roots.]