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.
Can a poison ivy rash be spread by scratching or touching it? You cannot spread poison ivy by touching your rash or the liquid from your blisters. Poison ivy is spread only if you scratch your skin while it still has oil on it. You may think your rash is spreading because new rashes appear over a number of days.