疋

The upper part represents the calf, and the lower part, 止, is a pictograph of a foot.

It can be confused with the character 正 (jeong), meaning "correct" or "straight," because of their visual similarity. However, 正 has a straight and upright form, while 疋 (필) includes additional decorative strokes that distinguish it.

It has multiple readings and meanings, including:

짝 필 ("paired"):

This specifically refers to two pairs (four items). A single pair (two items) is called 량 (兩), while two pairs that form one set are called 필 (疋)—thus 疋 represents four as two pairs.

발 소 ("foot"):

The original pronunciation is “seo”, but it has somehow become “so” as a secondary or colloquial pronunciation.

바를 아 ("correct"):

In this sense, it is interchangeable with 雅 (elegant, correct).