The word "Gu" has not been seen in oracle bone inscriptions (because oracle bone inscriptions were used for divination in the Shang Dynasty, so many characters from later generations have not been used in them, and some characters did not exist at that time). Now calligraphy There are usually two ways to deal with the problem of missing characters in Chinese: First, create characters yourself, such as the character "Gu", which is composed of "E" and "page". These two components are present in oracle bone inscriptions, so you can Make up the word "Gu" by yourself; the second is to use the character "Tongjia", which can be replaced by the word "hi" with the same sound as "Gu". The word "hi" already exists in oracle bone inscriptions.
So if you want to write the word "Gu", you can use these two methods (see picture).