G'day, "Digger" seems to be the preferred term of the media in Oz. Whenever they need a headline, the word used is "Digger".
I have the 1990 revised edition of W. H. Downing's "Digger Dialects" (1919), which dates it back to 1916, but without much provenance.
Another site with a lot of information on these topics is -
www.awm.gov.au corrected
Back to coins:
in 1904, the "basic wage" for an Australian worker was set at 42 shillings per week. At that time, this was sufficient for a worker to support a non-working spouse and three children.
Throughout WW1 the pay for a Digger was 6 shillings per day. Of this, 1s was "deferred" (akin to our modern concept of superannuation). Of course, this equates to the basic wage.
A "Tommy" at this time received one shilling per day, of which half was deferred.
At the start of WW2, a soldier's pay was the same as in WW1, but this was soon increased.
Australia's military heritage is well represented in our circulating coins and notes.
Captain Matthew Flinders RN (1774 - 1814) was one of the most accomplished navigators and cartographers of his age. Prisoner of War 1803~1810. He was depicted on the Australian ten-shilling note 1954~66; and together with George Bass, on the 50-cent coin of 1998.
Admiral Sir John Franklin RN FRGS (1786 - 1847) was a veteran of the Napoleonic Wars. He appeared on the 5-pound notes of 1954~66.
Admiral Arthur Phillip RN (1738 - 1814) was a veteran of the Seven Years War. He also served Portugal in the War against Spain. He appeared on the 10-pound notes of 1954~66.
Air Commodore Sir Charles Edward Kingsford Smith MC, AFC (1897 - 1935), featured on the 1966 $20 (paper) note, and the 1997 $1 coin.
Douglas Mawson OBE FRS (1882 - 1958) was a Major in WW1. He appeared on the $100 paper note of 1984.
Andrew Barton "Banjo" Paterson (1864 - 1941) was a famous Australian bush poet, journalist and author. He was a war correspondent for The Sydney Morning Herald during the Second Boer War, the Boxer Rebellion, and World War I. He served as a Major in WW1. He appears on the $10 note of 1993.
Lieutenant-Colonel Sir Ernest Edward "Weary" Dunlop, AC, CMG, OBE, KStJ (1907 - 1993) was an Australian surgeon, renowned for his leadership whilst being held prisoner by the Japanese during WW2. He appears on the 50-cent coin of 1995.
Edith Cowan (1861-1932) worked with the Red Cross and other organisations during WW1. In 1920, this work was recognised with the award of an OBE. She appears on the $50 note of 1995.
Dame Nellie Melba (1861-1931) worked tirelessly to raise funds for war charities. She also gave wartime concerts in North America. For her services to the war effort, Melba was made a Dame Commander of the Order of the British Empire in 1918. She appears on the $100 note of 1996.
Sir John Monash (1865-1931) had a distinguished military career from 1884 to 1919, rising to the rank of General. He appears on the $100 note of 1996.
The 20-cent, 50-cent, and $1 "Dancing Man" coins of 2005 commemorate the 60th Anniversary of cessation of hostilities in WW2.