AS 3112 is an Australian standard for mains power plug. It is also known as a Type I plug.
The plug matching the pictured socket, used in Australia, Argentina, New Zealand, Fiji, Papua New Guinea and Tokelau

Tokelau

Tokelau is a territory of New Zealand in the South Pacific Ocean that consists of three tropical coral atolls with a combined land area of 10 km2 and a population of approximately 1,400...

, has an earthing pin and two flat pins forming an inverted V-shape. There is an unearthed version of this plug as well, with only two flat V-aligned pins.
These flat blades measure 6.5 by 1.6 mm and are set 30° to the vertical on a nominal pitch of 13.7 mm.