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The Yijing Companion

A reference index

Yijing — 《易经》

The ancient Chinese Classic of Changes used for divination and philosophical guidance.

Zhouyi — 《周易》

The core, original Bronze Age text of the Changes before historical commentaries were added.

Yin / Yang — 阴 / 阳

The dual cosmic forces of receptive/passive energy (Yin) and active/creative energy (Yang).

Hexagram (Gua) — 卦

A six-lined symbol formed by stacking two trigrams, representing a specific cosmic situation.

Six Lines (Liu Yao) — 六爻

The individual horizontal lines that build a hexagram, read from bottom to top.

Trigram / Bagua — 八卦 / 三爻卦

A three-lined symbol representing a fundamental force of nature; there are eight total trigrams.

Yao / Line — 爻

The basic single building block of a hexagram, which can be either solid or broken.

Yin Line — 阴爻

A broken horizontal line representing receptive energy, written visually as “⚋”.

Yang Line — 阳爻

An unbroken horizontal line representing active energy, written visually as “⚊”.

Changing Line (Dong Yao) — 动爻

A moving line at peak energy that flips into its opposite state in the resulting hexagram.

Elder Yang (Lao Yang) — 老阳

A highly active, mature Yang line that is actively changing into a Yin line.

Young Yang (Shao Yang) — 少阳

A stable, growing Yang line that remains unchanged during the divination outcome.

Young Yin (Shao Yin) — 少阴

A stable, quiet Yin line that remains unchanged during the divination outcome.

Elder Yin (Lao Yin) — 老阴

A highly receptive, mature Yin line that is actively changing into a Yang line.

Line Positions (Gua Wei) — 卦位

The vertical placement of a line, which determines its timing and social status.

Bottom Line (Chu Yao) — 初爻

The first line of a hexagram, representing the beginning stage or hidden foundations.

2nd Line (Er Yao) — 二爻

The second line, representing inner modesty and the core of the lower trigram.

3rd Line (San Yao) — 三爻

The third line, representing a stressful transition state at the top of the lower trigram.

4th Line (Si Yao) — 四爻

The fourth line, representing cautious entry into the outer world and higher positions.

5th Line (Wu Yao) — 五爻

The fifth line, representing the ruler, peak success, and the ultimate position of authority.

Top Line (Shang Yao) — 上爻

The sixth line, representing the end of a cycle, retirement, or detachment.

Primary Hexagram (Ben Gua) — 本卦

The initial hexagram cast, representing the current situation and its immediate realities.

Transformed Hexagram (Bian Gua) — 变卦

The resulting hexagram formed after changing lines flip, showing future trends.

Nuclear Hexagram (Hu Gua) — 互卦

An internal hexagram formed by lines 2, 3, 4, and 5, revealing hidden core motives.

Change (Bian) — 变 / 变化

The fluid process of transformation as energy shifts from one hexagram state to another.

Omen / Sign (Gua Xiang) — 卦象 / 征兆

The symbolic imagery and omens presented by the layout of the lines.

Auspice — 吉 / 凶 / 先吉后凶

The qualitative verdict of a reading, ranging from good fortune to misfortune.

Judgment (Tuan) — 彖

The overarching summary text of a hexagram, explaining its main theme and advice.

Image (Xiang) — 象

The philosophical text explaining how the natural elements of the trigrams relate to behavior.

Line Statement (Yao Ci) — 爻辞

The specific poetic text assigned to an individual line when it is triggered.

☰ Qian — 乾

The Creative force representing Heaven, strength, fathers, and pure active energy.

☱ Dui — 兑

The Joyous force representing Lakes, open communication, youngest daughters, and pleasure.

☲ Li — 离

The Clinging force representing Fire, brightness, middle daughters, and intellectual awareness.

☳ Zhen — 震

The Arousing force representing Thunder, movement, eldest sons, and sudden awakening.

☴ Xun — 巽

The Gentle force representing Wind/Wood, penetration, eldest daughters, and flexibility.

☵ Kan — 坎

The Abyssal force representing Water, deep danger, middle sons, and emotional depth.

☶ Gen — 艮

The Keeping Still force representing Mountains, stillness, youngest sons, and boundaries.

☷ Kun — 坤

The Receptive force representing Earth, devotion, mothers, and pure yielding energy.

Five Elements (Wu Xing) — 五行

The five elemental energies that drive all natural cycles: Wood, Fire, Earth, Metal, Water.

Generating Cycle (Xiang Sheng) — 相生

The harmonious nurturing loop where each element births and strengthens the next sequential element.

Wood 生 Fire — 木生火

Burning wood feeds and creates a blazing fire.

Fire 生 Earth — 火生土

Fire reduces matter to ash, creating rich soil and earth.

Earth 生 Metal — 土生金

Deep earth compresses and concentrates minerals to form precious metal.

Metal 生 Water — 金生水

Metals melt into liquid forms, or condensation forms on metallic surfaces.

Water 生 Wood — 水生木

Rain and water nourish seeds to grow tall trees and plants.

Overcoming Cycle (Xiang Ke) — 相克

The balancing, destructive loop where elements control or destroy one another.

Wood 克 Earth — 木克土

Plant roots break through and deplete the soil.

Earth 克 Water — 土克水

Dirt walls dam up, absorb, and redirect flowing water paths.

Water 克 Fire — 水克火

Liquid douses, cools, and extinguishes burning open flames.

Fire 克 Metal — 火克金

Intense heat melts, warps, and reshapes hard metallic structures.

Metal 克 Wood — 金克木

Sharp metal axes chop down and clear away trees.

Changing Indicator — 动爻 (Dòng Yáo)

动 (dòng): Move, change, activate, or stir. 爻 (yáo): Line in a hexagram; Moving Yang: ─×─ (Old Yang, ritual number 9). Turns into a static Yin line (─ ─). Moving Yin: ─ o ─ (Old Yin, ritual number 6). Turns into a static Yang line (──).

Primary → Transformed — 本卦 (Běn Guà) → 变卦 (Biàn Guà)

The visual notation path showing how a situation shifts over time.

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The Hexagram Companion
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