The origin of the name X is unclear -- as with so many maritime symbols. It may have come from "Old Roger" which was slang for the devil. It may have come from the french for "red beauty" or joli rouge which likely referred to red flags (symbolizing blood) used by feared privateers in the 1700s. No matter its origin, however, its intent was clear: it was an intimidating signal to all who could see it.
Give me X. Also tell how this was an intimidating signal.