Key compounds: 账单 (zhàngdān, bill), 账号 (zhànghào, account number), 账户 (zhànghù, bank account), 记账 (jì zhàng, to keep accounts), 算账 (suàn zhàng, to settle accounts — can also mean 'to get even').
history
The 贝 (shell/money) radical shows this character is about finances. Ancient Chinese used shells as currency.
