Radio The traditional, in film and TV, response in radio communication "over and out" is a contradiction, since "over" means "your turn to speak" and out "means "end of conversation". I.e. "over and out" means "over to you but I won't be listening". Epistolary relates to letters.
A QR, or quick response, barcode is a machine-readable label, and encodes virtually any type of data including the standardised modes of alphanumeric, binary, numeric and what other kind?
In communication over two-way radios, in use by the military, police and fire despatching systems, and CB radio, what does "over" mean?
In various English-speaking countries, a flag is flown at what is said to be half mast as a mark of respect or mourning; in the U.S. (on land) the gesture is known as half what?
