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.
Myths: 1  Poison ivy rash is contagious. 2  The blisters and rash produced by the urushiol do not spread nor are they contagious to others. 3  You can however spread the rash if the urushiol has been left on your hands or clothes and they come in contact with other parts of your body or someone else.