An old word for weapons and military affairs, alive today mostly in set phrases: 投笔从戎 (abandon the pen for the sword) and 戎马 (war-horse, i.e. military life). It also occurs as the surname Róng.
The dagger-axe 戈 is the indexing radical and wraps the character: its first stroke comes early, then the last three dagger strokes finish the glyph after the inner element is written. A weapon is the heart of the 'military' meaning.
The inner cross is not the number 'ten' here — it stands for the 甲 armor or shield. Weapon plus armor together give the old general sense of 'arms' and 'the military' in 戎.
