Hi, What he said! I've got nothing to add - it just seemed a shame that the thread was so short All the best. Robert.
Bagua, ba gua, pakua, pa-kua, pa-koa, etc, are all refer to the same things. These are Western phonetic spellings of the two symbols for "ba" and "gua." However, from this there are a multitude of things pakua refers to. There is "the bagua" which is a mirror surrounded by trigrams that you see for sale in feng shui stores and such. "Pakua" also refers to a martial art, traditionally meaning circular movements for redirection and manipulation (this is my understanding, I'm sure others have similar but different versions), and an "internal" style. However, I also have heard that "pakua," translated as "8 transitions of change," refering to a method of thinking involving the I-Ching and an application of these changes to anything (so you can have pakua chuan, pakua chang, pakua sword, pakua cooking, etc). Hope that helps.