奥克托今 (HMX, aka octogen / àokètuōjīn) is a chemical high explosive, sometimes mixed with TNT. Common nicknames for it include High Melting eXplosive, Her Majesty’s eXplosive, and High-velocity Military eXplosive.
Why it is blocked: According to the History Channel show Weird Warfare, a powder form of the explosive that could be disguised as flour (and even cooked and eaten as a pancake) was developed by the U.S. Chinese guerrillas successfully used it against the Japanese during WWII. As it is a weapon, it has cause to be blocked, but unlike some of the others, the Chinese word for the chemical is so obscure that a search for the first three characters (which are unblocked) and subsequent check of the posts reveals that it has been used 12 times in in the past two years. Of course, it’s possible that censors have deleted all such posts, but a Google or Baidu search for the term doesn’t turn up much outside of chemistry references either. One wonders why the censors even bothered to block such an uncommon term. [Status - 11/22/11, 2/5/12, 3/12/12: blocked]
