Yours, Etc.: Origins and Uses of 8 Sign-Offs
"metal tag of a lace," meant to make it easier to thread through the eyelet-holes, but later merely ornamental, mid-15c., from Middle French aiguillette, diminutive of aiguille "needle," from Late Latin acucula, itself a diminutive of Latin acus "needle" (see acuity). Cf. Italian agucchia, Portuguese agulha, Spanish aguja "needle."