A ledger folio is a very thin column in the journal.
It is used to record the page number of the book on which the entry is posted into the ledger account.
It remains blank at the time of recording of transactions in the journal but is filled at the time of posting entries to the ledger account.
Final answer: Ledger folio is the column in the journal account to record the page no. of the book at which the entry is posted.