I Ching Glossary and FAQ

Define the structural terms used in an I Ching reading, then see how IChingAsk separates classical text, computed relationships, and one named changing-line protocol.

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Hexagram and trigram

A trigram is a stack of three broken or solid lines, giving eight possible structures. A hexagram is a stack of six lines, giving sixty-four possible structures; it can also be read as one lower trigram and one upper trigram. In IChingAsk, the six-line structure is canonical. Names, numbers, and translations identify or explain that structure, but they do not create a second version of it.

Yin, yang, and bottom-up line order

A broken line is conventionally called yin and a solid line yang. Positions are counted from the bottom: Line 1 is lowest and Line 6 is highest. IChingAsk stores and draws the stack in that bottom-up order. Its software may encode broken as 0 and solid as 1, but that is an implementation convention, not a claim that the classical text used modern binary numerals.

Moving line and resulting hexagram

In the four-value cast used here, 6 is moving yin, 7 stable yang, 8 stable yin, and 9 moving yang. The original hexagram draws 6 as broken and 9 as solid. The resulting hexagram flips only the moving positions: 6 becomes solid and 9 becomes broken, while 7 and 8 keep their polarity. Resulting names a computed changed state, not a forecast of what must happen.

Why a line heading says Nine or Six

A classical heading such as Nine in the Second Place identifies a yang line at Position 2; Six in the Second Place identifies yin there. Those headings belong to the text, so they remain the same whenever that hexagram is displayed. The actual cast can contain stable yang 7 or stable yin 8 at those positions. Read the cast value or moving marker to determine change; the Nine or Six in a textual heading is not evidence that every displayed line moved.

Judgment, Image, and line statement

Judgment is IChingAsk's short label for the core hexagram statement. Each of the six positions also has a core line statement. The Great Image comes from the Xiang commentary, a different textual layer. Their modern English is editorial work shown beside the classical text. Presenting these passages on one page does not make them one genre, one date, or one verified author's voice.

Favorable, misfortune, no fault: the judgment words

吉, 凶, 悔, 厲, and 无咎 are traditional divinatory assessments. IChingAsk usually renders them as favorable, misfortune, regret, danger, and no fault, with wording fitted to each passage. An action or condition can qualify the assessment: read the whole scene, not an isolated final word. The historical text belongs to a divination tradition; IChingAsk uses it for reflection. A cast does not establish what will happen to you, and no fault is not a promise of safety. Consider what the passage brings to your attention, then check your situation against evidence and your own judgment.

Upper, lower, and nuclear trigrams

Lines 1–3 form the lower trigram and Lines 4–6 the upper trigram. IChingAsk computes the nuclear structure by taking Lines 2–4 as its lower trigram and Lines 3–5 as its upper trigram. That definition is a transparent structural operation used throughout this product. English terminology and interpretive use vary across historical lineages, so the computed relationship is not presented as a universal reading rule.

Centered, correctly placed, and corresponding

Positions 2 and 5 are the centers of the two trigrams. IChingAsk also shows a common positional convention: yang at odd places and yin at even places is called correctly placed; opposite polarities at paired positions 1/4, 2/5, and 3/6 are called responsive. These labels describe relationships, not a score for good fortune. Interpretive conventions have limits: Wang Bi’s discussion of position does not assign fixed yin or yang places to the first and last lines. The wording and situation still govern the reading.

Inverse and complement

Inverse reverses the six positions: the top line becomes the bottom, the next becomes second, and so on. Complement keeps every position but flips each broken line to solid and each solid line to broken. The two operations can sometimes reach the same hexagram, but they are not synonyms. Neither operation is the same as a moving destination, which flips only the positions marked as moving in a cast.

King Wen order and binary order

King Wen order is the conventional name for the received 1–64 textual sequence. IChingAsk's binary view instead sorts each bottom-up six-line structure by weights 1, 2, 4, 8, 16, and 32, producing indices 0–63. Both views reorder the same canonical pages without changing their numbers or texts. Binary describes a two-state model here; it does not prove Fu Xi authored a binary diagram or make binary order the received sequence.

No moving lines

When no line moves, the original and resulting structures are identical. In the Zhu Xi protocol used by IChingAsk, the original Judgment is the reading focus. That does not mean the cast contains no material to examine, and it does not create an extra unchanged-line text. It identifies one passage as primary under one named protocol.

Multiple moving lines

This protocol uses the original moving line when there is one. With two, both original lines are read and the upper leads. With three, both Judgments are read and Zhu Xi's change chart determines the lead. With four, the two unchanged lines in the result are read and the lower leads; with five, the sole unchanged result line leads. When all six move, Qian and Kun use their special Use Texts, while other casts center the resulting Judgment. Other reading lineages may choose differently.

Use Nine, Use Six, and the product boundary

Use Nine belongs to Qian and Use Six to Kun. Each is a special core text without a line position; neither is Line 7, and neither creates a seventh line page. This protocol selects them only for the corresponding all-moving cast. More broadly, IChingAsk uses these texts and computed relationships to organize reflection. A resulting hexagram describes a transformation in the reading; it does not certify hidden facts or promise a future outcome.

Is the Forest of Changes the same text?

The work transmitted as Jiao shi Yilin, or Forest of Changes, arranges separate verses under pairs of hexagrams. Its Qian-to-Kun entry is therefore a different text from Qian’s Use Nine. A matching pair of hexagrams does not make two reading systems interchangeable. IChingAsk selects from the Zhouyi hexagram statements, line statements, and Use Texts under the stated Zhu Xi protocol; it does not silently substitute Yilin verses.

Sources 10

What this guide rests on

  • Zhouyi and received commentaries — Received text, Chinese Text Project. Primary navigation witness for the received core and named commentaries; not evidence for authorship or date.
  • Zhouyi, received hexagram order — Received text, Chinese Wikisource witness. The received 1–64 ordering only; not evidence for authorship, date, or intended meaning.
  • Chinese Philosophy of Change (Yijing) — Tze-ki Hon, Stanford Encyclopedia of Philosophy. Broken/solid line structure; composite textual layers, received attributions, broad Ten Wings dating, early Han canon formation, and later inquiry traditions; not proof of named authorship, ancient binary arithmetic, or a uniformly non-predictive tradition.
  • Introduction to the Study of the Changes (Yixue qimeng) — Zhu Xi; translated by Joseph A. Adler. The reconstructed yarrow-stalk procedure, conventional frequency model, and moving-line focus rules with their stated limits.
  • The Hexagram Sequence — Edward L. Shaughnessy, The Origin and Early Development of the Zhou Changes. The received order, inversion/conversion pairs, Xugua relationship, alternative Mawangdui order, and limits of a complete derivation.
  • Is the Fuxi liushisi gua fangwei diagram attributed to Shao Yong binary? — Marie-Julie Maitre, Science in Context. The two-element form of the Fuxi/Xiantian order and its attribution to Shao Yong; not evidence that Fu Xi authored the diagram or that it is the received King Wen order.
  • The Yi King — James Legge, translator. Notes on Qian and the line headings, with Zhun and Kan commentary as secondary checks. Historical authorship assumptions are not adopted.
  • Zhouyi zhu, with Zhouyi lueli (Commentary and Brief Remarks on the Changes) — Wang Bi. Ming tuan, Ming xiang, and Bian wei: the hexagram as a whole, images and meaning, and the limits of fixed positional rules.
  • Jiao shi Yilin zhu (Annotated Forest of Changes) — Work transmitted under the name Jiao Yanshou. The opening Qian group establishes the separate pair-indexed verses. Its commentary and later editorial notes are not incorporated into IChingAsk readings.
  • I Ching: The Classic of Changes — Edward L. Shaughnessy. The discussion of technical divination terms, including favorable, misfortune, regret gone, and no fault. IChingAsk’s reflective use is a product choice, not a claim that the historical text was non-predictive.

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