Many coins have a milled edge. The practice began hundreds of years ago to prevent people from scraping precious metal off the edges of coins.
These days, the milled edge is mostly decorative since there are no circulating coins made from precious metals.
The British One Pound coin has a milled edge and usually has an inscription on the edge - "DECUS ET TUTAMEN" meaning, "An ornament and a safeguard". This refers directly to the ornamental safeguard of the milled edge.
According to the good book, all British general circulation 50 Pence coins are heptagonal or 7 sided. There might be the occasional round bullion 50 Pence coin. The Australian 50 cent coin has 12 sides.
The Australian 50 cent coin from 1969 to present is a cupro-nickel coin with 12 sides. The image of Queen Elizabeth II on all Australian coins from 1999 to present was designed by Ian Rank-Broadley (IRB).
All coins have length, width and depth, and are thus 3D objects. The Australian 50 cent coin has twelve sides, and so is dodecagonal in shape.
Other than the 1966 coin, the only round 50 cent coin ever issued, the Australian 50 cent coin is a cupro/nickel dodecagonal (12 sided) coin of silvery appearance and is often used as a commemorative.See the link below.
Other than the initial Australian 1966 50 cent coin which was round, all subsequent Australian 50 cent coins from 1969 have been dodecagonal or 12 sided. Because they are of a similar size to the 20 cent coin, they were made 12 sided so that vision impaired people could feel the difference.
The Australian 50 cent coin was issued from 1969 as a 12 sided (dodecagonal) coin. This is to provide a good visual and tactile distinction for vision impaired people who may have trouble with coins of similar size.
Presumably, you refer to the Australian 50 cent coin. The round Australian 50 cent coin was only ever minted for 1966. All subsequent Australian 50 cent coins are dodecagonal or 12 sided.
There is no flower on the reverse of an Australian 50 cent coin.
A 50 cent coin and three 10 cent coins.A 50 cent coin, a 20 cent coin and two 5 cent coins.Four 20 cent coins.
50 cent
The US 50 cent coin has JF Kennedy on it.
The 50 cent coin bears the head of President John F. Kennedy