Obidos was the name used by Amazon.com for their original page rendering engine, and appears in many of their URLs such as http://www.amazon.com/exec/obidos/ASIN/0596515162. Obidos was phased out on August 31, 2006 at 20:59:17 PDT and replaced by the Gurupa engine. Amazon.com subsequently used the name for their building at 551 Boren Ave N Seattle, WA 98109.
It was named after the town of Óbidos in Brazil near the swiftest point on the Amazon River.
References
Obidos (software) Wikipedia(Text) CC BY-SA