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 Oak looks just like Poison Ivy. Only difference is that this form doesnât climb things. Poison Oak causes the same miseries as Poison Ivy. Some people appear to be immune to Poison Ivy, Sumac, or Oak and are lucky enough to have never had its terrible rash. Just remember, that like any other allergy, it is possible to lose immunity.