A warning sign with a red border and a black background. The sign has a red and black sticker with the word 'DANGER' in bold white letters. Below the sticker, there is a red and black sticker with a red circle containing a white silhouette of a person with a red diagonal line through it, indicating 'NO PERSONS'. Below the circle, there is a black sticker with the words 'UNAUTHORIZED PERSONS KEEP OUT' in white letters. The sign is attached to a white background with a black border.