How to Write 核 (hé) — Meaning “Core; Nucleus; Pit”

Imagine a wooden tree (木) growing a walnut. When you crack it open, the hard pit inside shouts "Hai!" — a sound like the right side 亥. This reminds you that 核 means the core or pit inside a fruit.

Write the left radical 木 first (horizontal, vertical, left-falling, right-falling), then the right side 亥 starting with a dot, then horizontal, left-falling, horizontal, right-falling, and finally a small hook. A common mistake is making the bottom of 亥 too closed like the character 害 — instead, keep the bottom strokes open and balanced.

核 (core/pit) uses 亥 on the right, while 杪 (treetop) has 少 (small) and 杭 (a place name) has 亢. Visually, the right parts are distinct: 亥 has a dot and several strokes, 少 is simpler, and 亢 has a different structure. In meaning, 核 is much more common in daily use (like 核心, 考核), whereas 杪 is rare and 杭 mainly appears in the city name 杭州.

核 appears in everyday words like 核心 (core), 核桃 (walnut), and 考核 (assessment). It is also essential in scientific terms like 核能 (nuclear energy). Culturally, walnuts (核桃) are a popular brain-shaped snack believed to be good for memory, and 核心 is frequently used in business and politics to mean the central part of something.

Common words containing 核 include: 核心 (hé xīn) — Core; Kernel; Center; 核桃 (hé táo) — Walnut; 考核 (kǎo hé) — To assess or evaluate..