virole

from The Century Dictionary.

• noun A circlet or little hoop of iron put round the end of a cane, a knife-handle, and the like; a ferrule; hence, in heraldry, a hoop or ring; one of the rings surrounding a trumpet or horn. Some writers apply it especially to the funnel-shaped opening at the larger end.
• In heraldry, same as veruled.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Her.) A ring surrounding a bugle or hunting horn.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun heraldry A ring surrounding a bugle or hunting horn.