It’s a common superstition: do not split a pole. That is, if two people are walking down the street, they shouldn’t each walk around a different side of a lamppost, telephone pole, or mailbox. But if they do, there’s a remedy: just...
steal-me flag n. an upright mailbox flag, which indicates there is mail for pick-up but is also considered a signal to mail thieves. (source: Double-Tongued Dictionary)
snorkel box n. a roadside mailbox with a projecting slot reachable from within an automobile. (source: Double-Tongued Dictionary)