There is no limit on the number of individuals honoured at any grade, and admission remains at the sole discretion of the monarch, with each of the order's five grades and one medal with three levels representing different levels of service. While all those honoured may use the prescribed styles of the order—the top two grades grant titles of knighthood, and all grades accord distinct post-nominal letters—the Royal Victorian Order's precedence amongst other honours differs from realm to realm and admission to some grades may be barred to citizens of those realms by government policy.