What does TIER stand for?

What does TIER mean?

TIER	Tier Technologies, Inc. Business » NASDAQ Symbols
TIER	Times Interest Earned Ratio Governmental » State & Local
TIER	Tactically Integrated Emergency Response Governmental » State & Local
TIER	Technical Independent Evaluation Report Governmental » Military
TIER	Total Integrated Engine Revitalization Governmental » Military
TIER	Total Integrated Engine Revitalization Governmental » Transportation
TIER	True Innocents Equine Rescue Miscellaneous » Unclassified

tier(n.): one of a series of rows or ranks rising one behind or above another, as of seats in an amphitheater.