武 appears in 武术 (wǔshù, martial arts), 武器 (wǔqì, weapon), 武汉 (Wǔhàn, the city), 武力 (wǔlì, military force). Contrasts with 文 (wén, civil/literary).
culture
The 文武 (wén-wǔ) duality — civil and martial — is central to Chinese thought. An ideal leader masters both: literary refinement (文) and martial strength (武).
Xinhua indexes 武 under the 止 (foot) radical, picking the four-stroke foot at the centre as the anchor. Classic 会意 reading: a foot marching with a weapon — military action. The 止 sits inside the 弋 weapon-frame, picturing the soldier on the move.
A single horizontal cap at the top of the character, part of the 弋-frame that wraps around the 止 inside. It marks the upper limit of the weapon-bracket and helps establish the upper-left-corner enclosure pattern of the whole glyph.
The 弋 weapon-frame wraps around the 止 foot, with its upper stroke coming first and the slanted body plus dot finishing the character. It supplies the 'weapon, military force' half of the compound, balancing the marching foot inside.