In literature, "signal red" is often employed as a vivid and arresting hue that immediately draws the reader’s attention. In one example [1], the term stands alone as a bold identifier, emphasizing its striking character. Another work [2] expands on this by aligning signal red with other intense shades such as vermilion, geranium red, and poppy red, thereby framing it within a spectrum of colors that evoke passion and urgency. This deliberate use of "signal red" serves not only to invoke strong visual imagery but also to underscore themes of boldness and immediacy throughout the narrative.