S52, S-52, or S.52 may refer to : * S52 (New York City bus), a bus line serving Staten Island * S52: Not recommended for interior use on large surface areas, a safety phrase in chemistry * BMW S52, a 3.2 L M3 version of the M52 engine * SIAI S.52, an Italian fighter aircraft prototype of 1924 * Sikorsky S-52, a 1947 helicopter * Shorland S52, an armoured car This disambiguation page lists articles associated with the same title formed as a letter-number combination. If an internal link led you here, you may wish to change the link to point directly to the intended article.