武 wǔ martial; military
Made up of [止 zhǐ to stop; to prohibit; until; footprint radical 77, 戈 gē spear radical 62]Made with 8 strokes.
Contains 'spear' and 'foot' suggesting a soldier and hence somthing military. 'Foot' may however be read as 'stop' with the concept of military interceding to 'stop' violence
Ancient small seal form 
Related characters
Also uses 止 zhǐ component: 步 bù (a step) 齿 chǐ (tooth) ; 此 cǐ (this) ; 定 dìng (to set) ; 正 zhèng (correct) ; 走 zǒu (walk) ; 足 zú (foot)
Also uses 戈 gē component: 成 chéng (to succeed) 戴 dài (to respect) ; 或 huò (maybe) ; 戋 jiān (narrow) ; 我 wǒ (I (me)) ; 戊 wù (fifth (ordinal)) ; 载 zài (to carry) ; 藏 zàng (treasury) ; 战 zhàn (to fight) ; 找 zhǎo (to try to find)
Sounds same
五 wǔ (five) ; 午 wǔ (noon)Different tone
乌 wū (crow) ; 屋 wū (house) ; 无 wú (not to have) ; 勿 wù (do not) ; 戊 wù (fifth (ordinal)) ; 务 wù (affair) ; 物 wù (thing)Cities
武汉 Wuhan, Hubei武夷山 Wuyishan, Fujian
武威 Wuwei, Gansu
People
洪武帝 Emperor Hongwu孙武 Sun Wu