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.
Poison Ivy, Oak and Sumac Guide. Poison ivy, oak and sumac, Poison ivy, oak, or sumac is found in every state except Alaska and Hawaii, with Nevada having some poison ivy along itâs eastern border with Utah and Idaho having poison ivy along itâs western border with Oregon. All three species and their sub species of plants are very hardy and adaptable.