亚军
yà jūn · HSK 5
runner-up
🥈 亚 (second) + 军 (army/rank) = second-ranked = runner-up
亚 means second or sub-, and 军 originally meant army but here means rank or position. Together they label the silver-medal slot. Compare 冠军 (champion, first place) which uses 冠 'crown' for the top spot.