갑

Noun

 * 1) armor; shell
 * 2)  the first of the ten heavenly stems

Counter

 * 1) cases; packs

Usage notes
As with most count words (a.k.a. classifiers), is preceded by native Korean numerals.

Noun

 * 1) box; case, carton

Noun

 * 1)  cape; headland

Etymology 4
Korean reading of various Chinese characters.