We're trying to decipher the meaning of the letters XRO on a document that might be related to the Earhart disappearance. The letters might stand alone or be part of a longer string of letters, but I can't think of an English word that includes the letters XRO together. Any context is a possibility, but the document probably dates from not-earlier-than 1936 and not-later-than 1945.
Any ideas?
You might have to search for Xray Romeo Zero rather than Xray Romeo Oscar.
So, for example, XR0 (not XRO) is the code block for Easter Island.
Wes Lamboley, W8FMG "has been an active ham since 1954 and has operated from VK4, J28, KX6 and XR0."
XR0 can also mean "Exchange Rate 0": XR1 and XR0 are the exchange rates for current money in El Salvador against the US dollar from the first day of indexation and on the immediately preceding indexation date, respectively.