There are four ways to write "fennel", i.e.: back,囘, and 囬. The fourth way to write the character "回" is "囗", an "eye" inside the "囗".

"Back" for the right word, "Shuowen Jiezi" interpretation: "back, turn also. It is from the enumeration, and the middle image is in the shape of turning back." And said: "FineLight, ancient text." In addition, the Kangxi Dictionary notes under "回" that "it is commonly called 囬." That is, "囬" is the common character for "回". Similarly, the fourth way of writing the word "回" is also a vulgar character.

From the evolution of the character form, we can see that the oracle bone character "回" in the spiral pattern with a short horizontal sign as a reference symbol, indicating the cycle of repetition, cycle after cycle; the Jinwen omitted the above reference symbol to strengthen the image of the spiral cycle; the seal script basically inherited the Jinwen glyphs, but increased the level of the spiral.

The above is the origin of the ancient word "囘". In the small seal script, the spiral is rewritten as two concentric circles inside and outside, which is the character "回". As for the other two characters, they are both variations of "回".

Expanded information:

There are many examples of a word that has the same meaning but different characters and multiple forms. It is not uncommon to see such examples in the dialect, such as a "brake angle", there are kill angle, brake cabinet, kill fruit, brake cut, kill each, kill, kill over, kill pot, etc. Various ways of writing. Zhao Pi also belongs to this category, and when it is put on paper and framed as a written word, there are three ways of writing, namely, restlessness, shame, and Zhao Pi

What is slightly different from the four ways of writing the word "aniseed" of fennel is that the four ways of writing aniseed are only very similar. And melancholy skin, shame skin, zhao skin, the head of the respectively for melancholy, shame, zhao, the only thing that is the same is only a layer of "skin" under the suffix. The only difference between the three leading words is the suffix "pi". The three leading words, according to the meaning of a single word, are in fact somewhat different.

Phoenix.com - "four ways to write the word back" and "the age of the official row rose