Banner n. : A kind of flag attached to a spear or pike by a crosspiece, and used by a chief as his standard in battle.

Banner n. : A large piece of silk or other cloth, with a device or motto, extended on a crosspiece, and borne in a procession, or suspended in some conspicuous place.

Banner n. : Any flag or standard; as, the star-spangled banner.

Example:
How do I put my online Banner advert on yahoo. I have tried calling the yahoo sales and adverts dept.?

Taxonomy
free encyclopedia, flag, proclamation, the United Kingdom, piece of cloth, elements, distinction, churches, Habakkuk, large-format, Trade union banners, design, vinyl banners, search, perspective, symbol, slogan, ancient craft.

Defination from the web:
Banner-making is an ancient craft. The word derives from late Latin bandum, a cloth out of which a flag is made (Latin banderia, Italian bandiera) ... The prophet Isaiah was commanded to raise a banner and exalt his voice (Isaiah 13:2) ...