According to ancient Chinese characters, 囘 (guwen) and 回 (zhuanwen) are two different words included in Shuowenjiezi. 囘 is the original form of a character meaning whirl. 回 is the original form of a character meaning around, while it's charater form following the form of 圍. There are some 回 meaning whirl in the unearthed documents, which cannot be changed to 圍.