A marker word refers to a word or phrase that indicates or highlights a specific point or idea. It helps to draw attention to important information or emphasize an important part of a sentence or conversation.
If you don't wish to use a clicker substitute click with whatever marker word you're planning on using. (servicedogsociety.com)
Learn about marker words and how to use them correctly. (petliferadio.com)
Unlike marker words which depend on the human voice (of which pitch and tone vary from person to person), the clicker is the same consistent sound every time. (pbrc.net)