Final answer:
In InDesign, a bullet point indicates the start of a new item in a list and can highlight key points. It is also used to flag changes in revisions, with edits typically shown in red or with a strikethrough. The colon is another formatting element that introduces lists.
Step-by-step explanation:
In InDesign, a bullet point is often used as a formatting tool to create a list of items or to highlight key points in a document. The bullet point functions as a visual cue that signifies the beginning of a new item or idea within a list. When a bullet point is used in a text, it can also indicate changes made to the document. In the context of revisions, changes in the text are often marked by a red square, which in electronic versions is hyperlinked to an entry below. The hyperlinked entry typically contains details about the changes, such as a page number for easy reference. Edits made directly to your document frequently appear in red, either for added text or with a strikethrough for deleted text. Additionally, a colon can introduce a list and is another element of formatting that can be used in conjunction with bullet points within a body of text.