Wade–Giles
However, the apostrophe was not well understood by people who do not know the Wade-Giles spelling, so many people who read the apostrophe ignored the apostrophe when reading or copying Chinese words down. This had lead many non-Chinese to say Chinese words incorrectly, including Tao, tai chi, and kung fu. Wade-Giles spellings where the apostrophe is completely ignored are called bastardized Wade-Giles.