The char data type in Rust supports numbers, alphabets, Unicode and special characters. Use the char keyword to declare a variable of character data type. Rust’s char type represents a Unicode Scalar Value, which means it can represent a lot more than just ASCII. Unicode Scalar Values range from U+0000 to U+D7FF and U+E000 to U+10FFFF inclusive.
```
let v = vec!['h', 'e', 'l', 'l', 'o'];
// five elements times four bytes for each element
assert_eq!(20, v.len() * std::mem::size_of::<char>());
```