Door numerals ( 0-9 ) & Alphabets ( A-Z) serve as vital navigation and address identifiers for postal workers, delivery personnel, and emergency services. These numerals come in a variety of materials—such as brass, stainless steel, or Malleable Iron—and are typically attached using screws . They range in size and style, from classic serif fonts to sleek, modern minimalist designs. To improve readability from the street, they are often placed at the top panel of a front door or beside the entryway.