戌戍戊

母親教我分:橫戌、點戍，戊中空。
戌 - the 11th hour in chinese hour.
戍 - 會意。從人持戈。甲骨文字形,象人負戈守衛邊疆。本義:防守邊疆。on guard, people who watches or guards for the rich/emperor.
戊 - 戊是天干的第五位。The 5th position of counting, like A, B, C, D, E - 甲,乙,丙,丁,戊,己。