Arts and entertainment':
WW (album), a 2005 album by the Norwegian metal group Gehenna
William Whopper, an evil property developer in the Australian 1980 children's TV programme Secret Valley
Wonder Woman, a fictional superhero
Businesses and organizations:
Bmibaby (IATA airline code WW)
WOW air (IATA airline code WW)
Winchester and Western Railroad (reporting mark WW)
County Wicklow, Ireland (vehicle plate code WW)
Westerwaldkreis, Germany (vehicle plate code WW)
"Warm white", a descriptor of light source color temperature, as defined in the JIS Z 9112 standard, and used by Exif tags
William H. Webster, a director of the FBI and CIA, referred to in the Kryptos sculpture as "WW"
"Wrong word", in proofreading
Both components, WW Aurigae A and WW Aurigae B, are detached white A-type main sequence dwarfs with a mean apparent magnitude of +5.82. As an eclipsing binary, WW Aurigae is classified as a variable star and its brightness varies from magnitude +5.79 to +6.54 with a period of 2.53 days.
The WW class were based on the earlier WG class 4-6-4T tank locomotives, but with a reduced boiler pressure of 180psi and larger cylinders. The initial batch comprising locomotives WW 556-575 were built at Hillside Workshops in 1913, and initially carried the WG classification before being reclassified as the WW class, the 'W' indicating that these locomotives were intended for suburban work in Wellington.
Following the success of the first twenty locomotives, Hillside delivered a further thirty locomotives which were classified WW from new. A further fourteen locomotives were rebuilt from the WG class at Hutt Workshops in two batches between 194042 and 1950-52.
Although most of the class were built with piston valves, WW 565 was delivered with slide valves, which were not suited to superheated steam, leading to their replacement with standard piston valves.
The WW class proved to be extremely versatile in service, being capable of handling almost any task. Initially both Auckland and Wellington received allocations of these locomotives which were used in suburban passenger service and occasionally on goods work; later allocations saw engines of this class allocated to the West Coast at Westport and Greymouth. Here, the locomotives worked mostly on coal trains and occasionally hauled branch line passenger services.
During the early 1950s, the decision was made to fit new higher-pitched boilers with deeper fireboxes to four WG class locomotives, Nos. 479, 480, 486 and 488, as a trial when they were rebuilt to WW class specifications. This required a new type of smokebox saddle, cab and enlarged coal bunker. This alteration was deemed to be successful, adding an extra 100 sq. ft. of heating surface; rather than rebuild the remaining six WG's due to the poor condition of their frames, NZR decided to rebuild twelve existing WW class locomotives, Nos. 571, 573-575, 644, 669, 672, 678-680, 683-684.
During the early 1960s, several of the WW class locomotives transferred from the North Island to Greymouth were altered to operate on the Rewanui Incline by the provision of 'trap-door' cowcatchers to clear the centre rail and additional air reservoirs on the tops of the side tanks. Following the removal of the centre rail in 1966, the locomotives' extra reservoirs were removed and the original brake pump was replaced by two larger pumps, one on each side of the smokebox.