What does BLUE stand for?

Baltic Latvian Universal Electronics - Electronics company

Best Linear Unbiased Estimator - Statistics

Blue Martini Software - NASDAQ symbol

Blue Ribbon Coach - NCIC trailer make code

Bluestone National Scenic River - Glen Jean, WV - National Park Service designator (NPSD)

Bluethroat - Common English name - Scientific name: Luscinia Svecica - American Ornithologists Union four-character bird identification (IBP)

Frederick Brewing - NASDAQ symbol

Frederick Brewing Co. - NASDAQ symbol (SAG)