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.