Please Knock Sign - Clear Door Notification for Privacy & Courtesy #3506183 (License: Personal Use)

This image features a vivid lime-yellow oval sign with a thin black border and centered uppercase black text stating “PLEASE KNOCK.” The high-contrast design ensures maximum visibility and readability from a distance, making it suitable for door placement in residential, office, or hospitality settings. Its clean, minimalist aesthetic conveys politeness while maintaining authority.

Commonly used on front doors, office entrances, or shared living spaces to request visitors announce their presence before entering; matches user intent for privacy, courtesy, or accessibility compliance.