'Scarlet' in the Bible

unless, when we come into the land, you tie this cord of scarlet thread in the window through which you let us down, and bring into the house your father and your mother and your brothers and all your father’s household [so that they will be safe].

She said, “According to your words, so be it.” Then Rahab sent them off, and they departed; and she tied the scarlet cord in the window.