An account book is a record keeping document used by businesses to keep a track of financial transactions. Synonyms for the term "account book" include ledger, register, logbook, journal, record book and balance sheet. A ledger can be used to keep track of financial records in a systematic manner. A register records the incoming and outgoing of goods and services. A logbook keeps track of any changes made and is often used for shipping and aviation industries. A journal is a record of business transactions that are chronological and systematic. A balance sheet is a summarized financial statement that shows the assets and liabilities of a business. These synonyms can be used depending on the type of financial records that need to be kept.