Final answer:
In LC-3 Assembly language, the semicolon (;) is used to mark the start of a comment, which the assembler ignores, serving as a tool for code annotation.
Step-by-step explanation:
The question pertains to the LC-3 Assembly language, where a semicolon (;) is indeed used to denote the beginning of a comment. In LC-3, anything written after the semicolon on a line is ignored by the assembler, allowing programmers to include explanations or annotations within their code without affecting the program's functionality. This is common across many programming and scripting languages as a means to improve code readability and maintainability.