- the code has four symbols, REV!, REV FL?, DECLARE?, ETH? REV! means "This pc is in trouble! Please do a review hard." REV FL? means "Could you please find out if this process if flat for me?" DECLARE? means "Pc has reached a grade or release. Please look at pc and if okay, pass on to Certs and Awards." ETH? means "This pc may be an ethics case, roller-coasters or no case gain." (HCO PL 4 Jul 65)