Final answer:
The most appropriate symbols to use to enclose a code block for a do-while loop are curly brackets {}.
Step-by-step explanation:
The most appropriate symbols to use to enclose a code block for a do-while loop are curly brackets {}. These symbols are commonly used in programming languages like C, C++, Java, and JavaScript to define the beginning and end of a block of code. The curly brackets help to clearly indicate the scope of the loop and improve code readability.
Learn more about Symbols for code blocks in do-while loops