The term is a noun phrase, in which "vector" is the head noun. The preceding proper noun, "Patriot Day," functions as a noun adjunct (or attributive noun) that modifies the head noun by specifying its theme. The principal part of speech for the subject is therefore a noun.
A "vector" in this context refers to a digital graphic file format constructed from mathematical equationsdefining points, lines, and curvesrather than a grid of pixels. This structure allows the image to be scaled to any size without loss of quality or clarity. The "Patriot Day" modifier specifies that the content of this graphic file is related to the U.S. observance on September 11, typically incorporating imagery such as the American flag, eagles, skylines, or symbols of remembrance and first responders.
In practical application, the term identifies a specific category of digital design assets. These scalable graphic files (e.g., .AI, .EPS, .SVG) are created for professional use in print or digital media to commemorate the event. Designers and organizations utilize these assets to produce high-resolution materials like posters, web banners, social media posts, and official documents, ensuring visual consistency and sharpness across all applications.
