* No global census: There is no standardized global census that specifically tracks language proficiency at this level of detail.
* Defining "trilingual": What constitutes being "trilingual" is subjective. Does it mean fluency in all three languages? A certain level of comprehension? The definition will impact the number.
* Language diversity: The world has thousands of languages, and many individuals are multilingual in languages not commonly tracked in statistics.
However, we can make some educated guesses:
* Prevalence of multilingualism: Multilingualism is common in many parts of the world, particularly in regions with diverse populations, historical migration patterns, or where multiple languages are official.
* Growing trend: With globalization and increased migration, the number of multilingual individuals is likely growing.
While we can't pin down a precise number, it's safe to say that there are millions of trilingual people in the world.