Number sign. Not to be confused with the Chinese character äº, the sharp sign (â¯), the viewdata square (â), the numero sign (â), the equal and parallel to symbol (â) or the game Tic-tac-toe's grid. The symbol # is most commonly known as the number sign, hash, or pound sign.
The poison ivy rash is not contagious. When a person touches the poison ivy leaf, a substance on the surface of the leaf (a resin) rubs off. Over the next 48 to 72 hours the skin reacts to the resin by becoming red and developing bumps and blisters at and around the site where the resin was.
The poison ivy rash itself is not contagious, according to the Dermatology Clinic at UAMS. Neither will fluid from the blisters of a poison ivy rash spread poison ivy. A poison ivy rash is caused by contact with urushiol, the oil from the leaves of the poison ivy plant. Only urushiol can cause a poison ivy rash. Typically by the time a rash has appeared, the urushiol oil is no longer present on the skin.