The term BELL SITE is a reference to the Bell Telephone Laboratories, which was a research and development company owned by AT&T. The company was founded in 1925 and was responsible for many of the technological advances of the 20th century, including the invention of the transistor, the laser, and the UNIX operating system. The crossword solution STEEPLE refers to the iconic bell-shaped building that housed the Bell Telephone Laboratories in New Jersey.