Stamford Hill, the neighborhood it appeared in, is thought to be home to the largest Charedi Jewish community in Europe, the BBC reports. The sign imitated the red triangular signs that are used on British streets to warn drivers of potential road hazards.
Instead of a normal symbol however it featured the silhouette of an orthodox Jewish man wearing a fedora.
Other signs, including one displaying the outline of an elderly woman, were reportedly seen in the neighborhood.
Diane Abbot, the area's Member of Parliament, said the signs were "disgusting" and "unacceptable."