I was just checking out the WatchGecko site and noticed they refer to everything as "strap." Are there any hard and fast rules for this? I generally consider anything made of leather/rubber/cloth to be a strap, and metal to a bracelet, while both can be referred to as a band. For reference, the dictionary definition of watchband is: the bracelet or strap of a wristwatch. Is there a proper/established nomenclature or are they arbitrary/interchangeable?