TSUMUGU · TOCFL C1 (est.) · 字
函
ㄏㄢˊ · hán
noun — a case, an envelope, a letter; verb — to contain, enclose
字源 FORM — what the parts do
函形an arrow held point-down in its casethe case wraps the shaft, the barb shows at the foot
An arrow stood point-down inside its case, the barb peeking out at the bottom. From the thing that wraps and holds comes the case, the envelope, then the letter sealed inside, and the verb — to contain.
故事 STORY — a scene to remember it by
箭尖朝下，整支收進套子，只剩倒鉤露在外頭。
The arrow point-down, the whole shaft slid into its case, only the barb left showing.
字源記憶法
意 · Meanings
(本義)函、劍函— a case, a sheath
→書函、來函— a letter, correspondence常用
→函蓋、包函— to contain, enclose
⇒函數、函式— a function (in math, programming) — the box that takes an input and holds a result常用
(本義) original meaning · → ⇒ each arrow = one more step of extension