In the last five years, DIY home theater builders have adopted as shorthand for "6 feet behind the listener" in 9.x.6 or 7.x.6 Dolby Atmos setups.
In a cinematic context, "06" often appears in search results related to specific showtimes or media highlights: imax 06
In 2006, most true IMAX theaters still used: In the last five years, DIY home theater
Title: IMAX 06 — What the Next Chapter of Immersive Cinema Means for Moviegoers In the last five years