The number 7. Bungie loves it, the following is a list of number 7 appearances I've noticed so far: The bounty guys logo are 7 three pointed stars; he gunsmiths logo is 7 bullets; at the vault (excluding the od shaped b&d) there are 7 purple lines and 7 white lines; some of the crates have a white nr.7 in a black sircle; heck if we want to push it a little destiny is 7 letters; and we know of the 7 mysterious coins; and of course there's the lucky7's achievement... I'm sure there sre many mre sevens and secrets.