The Vietnamese word "sổ cái" refers to a type of accounting ledger. It is essential in financial record-keeping and is used primarily in bookkeeping and accounting contexts.
While "sổ cái" mainly refers to an accounting ledger, in a broader sense, "sổ" can simply mean "book" or "register" in various contexts, and "cái" is a classifier for objects. However, in the context of finance, it specifically relates to ledgers.