Tango, Bravo

Why pilots say Mayday and 9 other codewords everyone should know

In situations where clear communication is paramount, especially when lives are at stake, professionals often rely on standardized codewords and phonetic alphabets designed to prevent confusion. Either from movies or from personal experience, it's probable that you've heard at least some of these before, and many have found their way into everyday conversation. Let's find out how many of these code expressions you can recognize.

Mayday is the international distress call used when the sender is in immediate, life-threatening danger. Pilots and mariners use it to signal that they require urgent assistance due to situations such as engine failure, fire, flooding, or medical emergencies.

The word was introduced in 1923 by British radio officer Frederick Stanley Mockford, who based it on the French phrase m'aider, meaning "help me," in an attempt to make it internationally recognizable. Hearing this transmission immediately alerts emergency responders that every second counts.

Not every emergency is severe enough to warrant a mayday call. When a crew faces a problem that is urgent but not immediately life-threatening, the appropriate codeword is Pan-Pan.

Like mayday, it comes from French: it derives from panne, meaning a breakdown or mechanical failure. A Pan-Pan call might be used if an aircraft loses an engine but can still fly safely, or if a ship experiences equipment problems while remaining under control. It tells responders that assistance is needed, but that the situation has not yet become critical.

Few emergency signals are as universally recognizable as SOS. Contrary to popular belief, the letters do not officially stand for "Save Our Ship" or "Save Our Souls." It was adopted in 1906 because SOS is an extremely simple, easy-to-transmit, and unmistakable pattern in Morse code.

SOS remains one of the world's most enduring distress signals, and it's still recognized by rescue organizations all around the globe.

In the NATO phonetic alphabet, each letter is assigned a unique word to eliminate confusion when radio transmissions are distorted by noise or poor reception. If you've ever heard someone spell a name as "Mike Alpha Romeo Yankee," you've encountered the NATO phonetic alphabet.

The system was officially adopted by NATO in the 1950s and is now widely used by militaries, airlines, emergency responders, and many police departments worldwide. Using it greatly reduces the chance of misunderstanding important information over radio.

Roger dates back to the early days of radio communication, when the letter R stood for "received." Before the adoption of the NATO alphabet, the US military used Roger instead of Romeo to represent that letter_._

Although modern communications systems have changed and the US military has fully embraced the use of the NATO alphabet, Roger remains standard aviation terminology, and it's one of the best-known radio acknowledgments in the world. It conveys a very simple but important meaning: "I have received and understood your message."

Although many people assume Roger and Wilco mean the same thing, they actually convey different messages. Wilco is short for "will comply." In other words, it tells the sender not only that the message was received and understood, but that the instruction will be carried out.

Saying both Roger and Wilco is technically redundant in proper radio communication, since complying necessarily implies understanding, but the combination is often heard in movies and television.

In the NATO phonetic alphabet, Tango simply represents the letter T. However, US military personnel have also adopted it as a shorthand when referring to a target or a hostile.

This secondary meaning became widely known through military operations in the twentieth century and has since appeared in countless books, films, and video games in phrases like "We've got one Tango moving north."

Oscar Mike, NATO for the letters O and M, is military shorthand for "On the Move." It's a quick way of reporting that a unit has begun moving toward its objective.

The expression is especially common in the US military and has become more familiar to the general public through documentaries, memoirs, and films. It's finding its way into civilian life, meaning simply "I'm heading out."

Ten-codes were developed during the 1930s to allow for brevity and standardization of message traffic in radio communications. They were widely adopted by US public safety departments and by radio enthusiasts.

While the system is being slowly phased out in favor of plain language communications, many local police, fire, and sheriff departments keep using it, and it is still strongly associated with radio culture by the general public. One of the most famous ten-codes is 10-4, meaning "received and understood."

Hospitals around the world use color-coded announcements to communicate emergencies without causing unnecessary panic among patients and visitors. Perhaps the best known is Code Blue, indicating that a patient is experiencing cardiac or respiratory arrest and requires immediate medical assistance.

While some hospitals use their own custom color codes, Code Blue has become so widely recognized that it now appears frequently in television dramas and everyday conversation whenever someone refers to a life-threatening medical emergency.

Identity crisis

How Siam became Thailand and 9 other countries that chose to rebrand

Image: pure julia

Countries rename themselves for many reasons—shedding colonial pasts, embracing local languages, or settling political disputes. Some changes are subtle, others dramatic, but each reflects deep historical, cultural, or geopolitical shifts. Here are 10 times a nation decided to swap out its old name for a new identity.

Image: Yves Alarie

In 1989, the ruling military junta of the country changed "Burma" to "Myanmar" to reflect what it said was a more inclusive, indigenous identity. The name "Burma" was strongly associated with British colonialism and the dominant Bamar ethnic group.

The UN and many countries recognized the change, but some, like the U.S. and UK, resisted for years as a political stance against the unelected military regime behind the change.

Image: S'mile Vilakati

In 2018, King Mswati III declared that Swaziland would become Eswatini, meaning "land of the Swazis" in the local language. He announced the change during the country’s 50th independence anniversary.

The king cited confusion with Switzerland and a desire to break with colonial-era names as reasons. Also, the new name had already been in unofficial use for years during local events.

Image: Hendrik Cornelissen

In 1972, the island nation officially changed its name from Ceylon to Sri Lanka after becoming a republic. "Sri Lanka" derives from Sanskrit, meaning "resplendent island."

The name "Ceylon" was tied to Portuguese, Dutch, and British colonial rule. However, some companies (like Ceylon Tea) still use the old name as a global brand.

Image: Kaysha

In 1997, after the dictatorial regime of Mobutu Sese Seko was overthrown, Zaire reverted to its pre-1971 name: the Democratic Republic of the Congo.

"Zaire" had been Mobutu’s attempt to Africanize the nation, but reverting to the original name also caused its own problems, since its neighbor is also named the Republic of the Congo, leading to some confusion for both locals and tourists.

Image: Ljupco Dzambazovski

After years of dispute with Greece over the name "Macedonia," the country officially became North Macedonia in 2019. Greece claimed "Macedonia" implied a territorial claim over its northern region of the same name.

The compromise unblocked North Macedonia’s path to NATO and EU talks. Though controversial domestically, the change ended a decades-long diplomatic standoff.

Image: allPhoto Bangkok

Under the Khmer Rouge regime, the country was known as Democratic Kampuchea. After the regime’s fall in 1979, the name gradually returned to "Cambodia," the anglicized form of the original name.

By 1993, with the monarchy restored and a new constitution, "Kingdom of Cambodia" became official. "Kampuchea" is still used in the Khmer language, but not internationally.

Image: Road Ahead

In 1984, revolutionary leader Thomas Sankara renamed Upper Volta to Burkina Faso, meaning "Land of Incorruptible People" in local languages. The old name referred to river tributaries of the region.

Sankara saw the change as a break from colonial legacy and a tribute to national dignity. The people became known as Burkinabé, a new term coined to reflect unity.

Image: Azhar J

This was more a rebranding than a true name change. "The Netherlands" has always been the country’s official name, whereas "Holland" refers only to two provinces. In 2020, the Dutch government stopped using "Holland" in international marketing to avoid confusion.

The change was part of a tourism and trade branding overhaul, with major events like Eurovision and the Olympics adopting "Netherlands" exclusively in their materials.

Image: Mathew Schwartz

In 1939, and again officially after WWII in 1949, the country dropped the name Siam to become Thailand, meaning "land of the free."

The change was mainly driven by a nationalist movement that sought to unify the country under a more inclusive Thai identity. While the name "Siam" carried some specific cultural connotations, the name "Thailand" emphasized sovereignty and the ethnic majority’s rule.

Image: Chloe Evans

In 1980, the unrecognized white minority government of Rhodesia was replaced, and the country became Zimbabwe, derived from "Great Zimbabwe," an ancient city of the region.

The old name honored British imperialist Cecil Rhodes. The new one reclaimed African history and identity after years of brutal conflict.