The term functions as a compound noun phrase, specifically a proper noun, which names a niche internet phenomenon. It does not refer to a verifiable cryptographic system but rather to a collection of enigmatic and esoteric posts that circulated on online forums, primarily 4chan. These posts are associated with fringe conspiracy theories alleging they contain coded information related to the September 11th, 2001 attacks.
The core concept revolves around a series of seemingly random or nonsensical posts, often containing unusual word combinations and alphanumeric strings. Proponents of the theory believe these posts are not random but are encrypted messages from a cryptic sourcevariously speculated to be a government insider, a time traveler, or an advanced artificial intelligence. The objective, according to the theory, is to decipher these messages to uncover a hidden truth or alternate narrative about the 9/11 events. However, no consistent key, algorithm, or decryption method has ever been established; all interpretations are based on speculation and community-driven pattern-seeking.
Ultimately, the phenomenon is best understood as a form of digital folklore or a case study in apophenia, which is the tendency to perceive meaningful patterns within random data. It represents a user-generated mythos created and sustained within a specific online subculture. Its significance is not cryptographic but cultural, demonstrating how online communities can collaboratively construct complex, unfalsifiable narratives around significant historical events.