The strange symbols are known as 'apotripaic marks' and have been found in some of the most important buildings
in England.
People might have strange "witch markings" carved into the walls of their house and not even know it.
The public are being asked to look for the u unusual symbols in their houses as part of a Halloween effort launched
by the government.
The markings have previously been found in historic buildings including the house where Shakespeare was born and
the Tower of London.
They're thought to have been used as a protection symbol, keeping the people inside the house safe from witches
and other threats, and tend to be come from a time when belief in the supernatural was widespread.
But a full record of where the symbols appear has never been taken, and so it isn't clear how common they are or
where they tend to appear. As such, Historic "England" has asked the public to look out for the the symbols, and
submit any information or pictures that they find so that they can be better understood.
The apotripaic marks tend to be carved into stone or woodwork near entrances like doorways, windows and
fireplaces. It's thought that they would then ward off witches and evil spirits from entering, keeping the people
Inside safe.