what does one and a half storey mean
Storey Split-level homes have floors that offset from each other by less than the height of a full storey. A mezzanine, in particular, is typically a floor halfway between the ground floor and the next higher floor. Homes with a split-level entry have the entire main floor raised half a storey height above the street entrance level, and a basement that is half a storey below this level. In Macy's Herald Square, there is a "one-and-a-half" floor between the first and second; this can be considered a split level floor.
Half-mast In the United States, the usual government term for non-nautical use is "half-staff." While the term "half-mast" is commonly used in place of half-staff, U.S. law and post-WW-I military tradition indicate that "half-mast" is reserved to usage aboard a ship, where flags are typically flown from masts, and at naval ships ashore.[54][55] Elsewhere ashore, flags are flown at "half-staff." In addition, flags are lowered to half-staff, not raised.[56]