If you are searching for this term, you are likely looking for one of the following specific pieces of Minecraft history:
The confusion begins with how Notch (Markus Persson), Minecraft’s creator, initially versioned his game. Before the official “Alpha” phase (which ran from June 28, 2010, to December 20, 2010), there were two earlier development stages: (free, creative-only browser tests) and Pre-Classic (the very first prototypes in 2009). alpha minecraft 000 exclusive
Here is a blog post exploring this eerie digital urban legend. If you are searching for this term, you