Just so you don't get confused if you go looking for equipment. Ive lifted for too long, I think my friends redhotcoach and cannonball are off just a tad.
The 25lb barbell is actually a "curl" barbell, it's shorter than a regular barbell. It comes in two designs, one is straight and the other is curved at the handles to work different parts of the arm muscles by grip.
I've never seen a 40 or 50lb barbell, the only size that heavy should be the standard Olympic barbell for competitions and it's 45lb.
I've still got my Olympic set from when I was 15 years old. My wife uses it frequently, she says the barbell makes a great clothes hanger for items to dry.