Final answer:
The light is characterized by a red group flashing pattern with two flashes every 10 seconds, a height of 160 feet, and a visible range of 19 nautical miles.
Step-by-step explanation:
The characteristic that describes the light in the question 'Gp Fl R (2) 10 sec 160 ft 19M' is a group flashing red light with two flashes every 10 seconds, located at 160 feet above mean sea level, and a nominal range of 19 nautical miles. The group flashing (Gp Fl) signifies a light that flashes in groups, in this case, two flashes (R (2)) as specified. The period of 10 seconds (10 sec) is the duration within which one complete sequence of the light, including the darkness between the groups, recurs. The height of the light (160 ft) specifies the physical height of the light structure itself. Lastly, the nominal range (19M), measured in nautical miles, indicates the distance at which the light can be seen under meteorological visibility conditions.