The ancient Egyptians were the first to use keys in the world. Their lock is to insert a wooden door bolt into a slot, and there is a wooden bolt on the top of the slot. After the door bolt is inserted into the groove, the wooden bolt will be inserted into the hole of the door bolt. In this way, the bolt of the door is firm and must be opened with a key.
Because the Egyptian lock can only be used on the side with the door bolt, which is not conducive to opening and closing flexibly, on this basis, the Greeks developed a lock that can be opened from the other side. The key made by the Greeks is a curved wooden stick, which is very similar to the small sickle used by farmers in shape and size. But there are also some keys that are 3 feet long and must be carried on their shoulders to move. They are quite heavy.
Skeleton key is the key with only the most basic skeleton structure. Able to open all locks. Today we have collected some unique Skeleton key tattoos. I hope these tattoos can inspire you.