ferrule or ferule (FER-uhl, FER-ool) - n., a ring or cap usually of metal put around a slender shaft to strengthen it; a usually metal sleeve used especially for joining or binding one part to another.
An example of the former type include a band around a cane or a cap on a walking stick. Examples of the latter are numerous: the aglet at the end of a shoelace, the crimped band holding the bristles of a paintbrush onto the handle, a brushing securing a pipe joint, a ring holding a knife or chisel blade to the handle, the joint between sections of a fishing rod, and so on and so forth. First appeared in this form a little after 1600 as an alteration (influenced by Latin ferrum, iron) of Middle English verrele, from Old French virole, from Latin viriola, little bracelet, diminutive of viriae, bracelets. Which is an interesting series of shifts.

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---L.
An example of the former type include a band around a cane or a cap on a walking stick. Examples of the latter are numerous: the aglet at the end of a shoelace, the crimped band holding the bristles of a paintbrush onto the handle, a brushing securing a pipe joint, a ring holding a knife or chisel blade to the handle, the joint between sections of a fishing rod, and so on and so forth. First appeared in this form a little after 1600 as an alteration (influenced by Latin ferrum, iron) of Middle English verrele, from Old French virole, from Latin viriola, little bracelet, diminutive of viriae, bracelets. Which is an interesting series of shifts.
Thanks, WikiMedia!
---L.