The so-called "oracle calligraphy" generally has two meanings.
First, it refers to the calligraphy works neatly imitated according to the font structure and calligraphy characteristics of Oracle Bone Inscriptions in Shang and Zhou Dynasties. This kind of works can collect ancient Chinese characters and combine them into new sentences as needed. Although the content is new, the writing is as rich and elegant as that written by Yin people three thousand years ago. However, there are only more than 2,000 words in Oracle Bone Inscriptions, among which many rare words (especially names and places) have not been released, and few of them are really useful.
Therefore, once you encounter a word that is not in Oracle Bone Inscriptions, and it can't be replaced in the written couplets and inscriptions, you have to split it with radicals and splice it yourself; If you can't spell it again, you will have to turn to other ancient Chinese characters such as inscriptions on bronze. The leading figure in this creation is Luo Zhenyu.
On the other hand, it refers to the modern calligraphy works that I created by drawing lessons from the characteristics of Oracle Bone Inscriptions. They regard Oracle Bone Inscriptions as an inspiration, just a little inspiration in artistic creation, instead of pursuing "similarity". Therefore, they don't write strictly according to the characteristics of oracle calligraphy, but may combine the characteristics of Oracle Bone Inscriptions, bronze inscriptions and Warring States scripts to create. Although this kind of calligraphy art is related to ancient philology, it is not the same.