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The phrase "Hello World" is correct and usable in written English.
It is typically used as a greeting or an informal way to say hello or acknowledge someone's presence. For example, you could write "Hello World, I'm excited to share my latest project with you!".
Dictionary
hello world
noun
A simple first program for any purpose.
Exact(56)
3 30am: Hello world, it's me again.
Always start with the simple hello world.
For example, "Hello, World" could be written as ! HELLO.F90 -- HELLO WORLD PROGRAM.
Hello World.
Hello, World!
"Hello world," it said.
4.29pm GMT Hello world!
Similar(4)
You'll be writing Hello-World-Programs in no time!
Hello world! will show up as superscript: Hello world!
The parentheses around ("Hello World").
You should see "Hello World".
Write better and faster with AI suggestions while staying true to your unique style.
Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com