Oracle bone script is the oldest attested form of written Chinese, dating to the late 2nd millennium BC. Inscriptions were made by carving characters into , usually either the shoulder bones of oxen or the plastrons of turtles. The writings themselves mainly record the results of official divinations carried out on behalf of the Late Shang royal family. These divinations took the form of scapulimancy where the oracle bones were exposed to flames, creating patterns of cracks that were then subjected to interpretation. Both the prompt and interpretation were inscribed on the same piece of bone that had been used for the divination itself.
Out of an estimated 150,000 inscriptions that have been uncovered, the vast majority were unearthed at Yinxu, the site of the final Shang capital (modern-day Anyang, Henan). The most recent major discovery was the Huayuanzhuang cache found near the site in 1993. Of the 1,608 Huayuanzhang pieces, 579 bear inscriptions. Each of the last nine Shang kings are named in the inscriptions beginning with Wu Ding, whose accession is variously dated between 1250 and 1200 BC. Oracle bone inscriptions corresponding to Wu Ding's reign have been radiocarbon dated to 1254–1197 BC (±10 years). Following the overthrow of the Shang by the Zhou dynasty in , divination using milfoil became more common; far fewer oracle bone inscriptions are dated to the Western Zhou. No Zhou-era sites with a comparable cache of inscriptions to Yinxu have been found; however, examples from this period appear to be more widespread, having been found near most major population centers. New sites have continued to be discovered since 2000.
The oracle bone inscriptions—along with several roughly contemporaneous bronzeware inscriptions using a different style—constitute the earliest corpus of Chinese writing, and are the direct ancestor of the Chinese family of scripts developed over the next three millennia. Their study is essential for the research of Chinese etymologies. It is also the direct ancestor of over a dozen East Asian writing systems. The length of inscriptions ranges from 10 to over 100 characters, but a few dozen is typical. The subjects of concern in inscriptions are broad, and include war, ritual sacrifice, and agriculture, as well as births, illnesses, and deaths in the royal family. As such, they provide invaluable insights into the character of late Shang society.
It is known that the Shang people also wrote with brush and ink, as brush-written graphs have been found on a small number of pottery, shell and bone, and jade and other stone items, and there is evidence that they also wrote on bamboo (or wooden) books just like those found from the late Zhou to Han dynasty periods, because the graphs for a writing brush ( , depicting a hand holding a writing brush) and bamboo book ( , a book of thin bamboo and wooden slips bound with horizontal strings, like a Venetian blind turned 90 degrees), are present in oracle bone inscriptions.
Since the ease of writing with a brush is even greater than that of writing with a stylus in wet clay, it is assumed that the style and structure of Shang graphs on bamboo were similar to those on bronzes, and also that the majority of writing occurred with a brush on such books. Additional support for this notion includes the reorientation of some graphs, by rotating them 90 degrees, as if to better fit on tall, narrow slats. The style must have developed on books of bamboo or wood slats, and then carried over to the oracle bone script. Additionally, the layout of characters in columns from top to bottom is mostly carried over from bamboo books. In some instances, characters are instead written in rows in order to match the text with divinatory cracks; in others, columns of text rotate 90 degrees mid-phrase. These are exceptions to the normal pattern of writing, and inscriptions were never read bottom to top. Columns of text in Chinese writing are traditionally laid out from right to left; this pattern is first found with the Shang-era bronze inscriptions. However, oracle bone inscriptions are often arranged with columns beginning near the center of the shell or bone, then moving toward the edge such that the two sides mirror one another.
By the late Shang, oracle bone graphs had already evolved into mostly non-pictographic forms, including all the major types of Chinese characters now in use. Loangraphs, phono-semantic compounds, and associative compounds were already common. One structural and functional analysis of the oracle bone characters found that they were 23% pictographs, 2% simple indicatives, 32% associative compounds, 11% phonetic loans, 27% phono-semantic compounds, and 6% undetermined.
Although it was a fully functional writing system, the oracle bone script was not fully standardized. By the early Western Zhou period, these traits had vanished, but in both periods, the script was not highly regular or standardized; variant forms of graphs abound, and the size and orientation of graphs is also irregular. A graph when inverted horizontally generally refers to the same word, and additional components are sometimes present without changing the meaning. These irregularities persisted until the standardization of the seal script during the Qin dynasty.
There are over 30,000 distinct characters found from all the bone fragments so far, which may represent around 4,000 individual characters in their various forms. The majority of these still remain undeciphered, although scholars believe they can decipher between 1,500 and 2,000 of these characters. One reason for the difficulty in decipherment is that components of certain oracle bone script characters may differ in later script forms. Such differences may be accounted for by character simplification and/or by later generations misunderstanding the original graph, which had evolved beyond recognition. For instance, the standard character 'autumn' now appears with the components 'plant stalk' and 'fire', whereas the oracle bone form depicts an insect-like figure with antennae – either a cricket or a locust – with a variant depicting fire below said figure. In this case, the modern character is a simplification of an archaic variant 𪛁 (or 𥤚) Shuowen Jiezi entry for 秋 (秌): 从禾,省聲。𪛁,籒文不省。 which is closer to the oracle bone script form – albeit with the insect figure being confused with the similar-looking character for 'turtle' and the addition of the component.
Some characters are only attested in the oracle bone script, dropping out of later usage and usually being replaced by newer characters. An example is a fragment bearing character for 'spring' that has no known modern counterpart. In such cases, available context may be used to determine the possible meaning of the character. In other cases, the character may be assumed to be a phono-semantic compound, and a rough meaning can be inferred based on the semantic component. For instance, an oracle bone character was recently found which consists of on the left and on the right ( when converted from oracle bone forms to their modern printed equivalents). This character may reasonably be guessed to a compound with 'altar' as the semantic and (modern reading sheng) as the phonetic. Though no modern character consists of these two components, it likely refers to a type of Shang dynasty ritual with a name similar to the pronunciation of in Old Chinese. In the same collection of fragments, the character was surmised to be a place name, since the semantic component means 'mound', 'hill', and the divination concerned the king traveling for a royal hunt.
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