Final answer:
A sign that directs a person to do something is known as a signpost. These can provide guidance and inform individuals about directions or actions to take, and when used rhetorically in speeches, they serve to structure and emphasize the content being presented.
Step-by-step explanation:
The sign that directs a person to do something is commonly referred to as a signpost. These signs serve as a guidance system to inform individuals about various actions they should take, like which direction to move in, or provide critical information such as distances to specific locations. Signposts can be literal, like those for road navigation, or figurative, such as rhetorical devices in a speech or presentation that guide the audience through the content. Additionally, symbols and signs can convey messages beyond their conventional meanings when used in different contexts, such as making a political statement or defying cultural norms.
Signpost language in presentations helps to orient the listener to the structure of the speech, indicating transitions between sections or emphasizing important points. Consider an informative signpost that tells you how far you are from a particular town - not only does it mention the distance, which is a scalar quantity, but it also indicates the direction, forming what's known in physics as a displacement vector.
In non-literal usage, signposting can help emphasize a script's central discussion, such as discussing the repercussions of restrictions on service animals. It alerts the listener to pay attention to the significance of what's being discussed. In essence, these markers act as cues to either action or attention, depending on their context.