This can get confusing, maybe this can help clear it up- Qi is pronounced "chee" and sometimes written as Chi- refers to the energy that underlies life. Taiji, or Tai Ch'i uses a different character that means "Ultimate" or "highest point" . So although TaiCh'iChuan sounds like it has Chi in it's name -and certainly has Chi in its practice- it actually translates to "Great Ultimate Fist/style"