However , post-nominal letters of the order are not used outside the organization itself and a Knight and Dame may not use the prefix Sir or Dame , though they may request from their local heraldic authority a personal coat of arms , should they not already be entitled to use one , and have it adorned with emblems of the Order of St. John .
Post-nominal letters of the order are not used outside the organization itself , and a Knight and Dame may not use the prefix sir or dame , though they may request from their local heraldic authority a personal coats of arms , should they not already possess any , and have it adorned with emblems of the Order of St. John .