The star is just an 1-digit field for "flag". I don't think there are any defined semantics for the field but by convention 'star' means something 'no special flags on this transaction'.
People use other flags to indicate, for instance, whether a transaction has been reconciled, or cleared their bank, or whatnot.
People use other flags to indicate, for instance, whether a transaction has been reconciled, or cleared their bank, or whatnot.