I would say it was marketing. It's a way to tell me the different levels, bronze being the lowest and platinum being the best.

ACA plans are divided by metal tier (bronze, silver, gold or platinum). A metal tier depends on a plan’s premiums and out-of-pocket costs. Bronze plans have the lowest premiums but highest out ...

The tiered bronze-silver-gold-platinum recognition system seeks to motivate communities in their solar energy endeavors. Get daily updates on the Packers during the season. Four local communities ...