What does SPDR stand for?

What does SPDR mean?

SPDR	Standard & Poor's Depository Receipts Business » Stock Exchange
SPDR	Standard & Poor's Depository Receipts Business » General
SPDR	Seattle Purebred Dog Rescue Community » Non-Profit Organizations
SPDR	Single Player Demo Release Community » Sports
SPDR	Secure Protected Development Repository Computing » Security
SPDR	Standard Poors Depositary Receipts Miscellaneous » Unclassified
SPDR	System Peril Distributed Reflex Medical » Physiology
SPDR	Software Preliminary Design Review Governmental » NASA