札
さつ · satsu · JLPT N3 · noun
bill
💴🏷️ 札 = 木 wood + 乚 hook: a wooden tag that became a paper bill
Before paper, notes and labels were written on thin wooden slips, hence the 木 radical. 札 still means tag or label, as in 名札 (nafuda, name tag), and also banknote, as in 千円札 (sen'en-satsu, a 1,000-yen bill).
ふだ · fuda · JLPT N1 · noun
ticket
🎫 札 = fuda: a paper ticket or tag, like a fu-da (ふだ) name card stuck on an item
札 (ふだ) names a card, tag or ticket. Fuda sounds like 'who-da' when you ask what a tag says. Think: every item at a shop has a 札 price tag.