As the period of mourning for Queen Elizabeth II reaches its conclusion, Buckingham Palace has released images of King Charles III’s cypher.

The monogram will begin to replace the Queen’s on all state documents, government buildings, and some post boxes.

Designed by the College of Arms, His Majesty hand-picked the design with the letter “C” for Charles, featuring “III” in the centre and an “R” for Rex which means King in Latin, sitting below an emblem of the crown.

In addition to the new cypher, coins, banknotes and stamps will begin the transition from the Queen’s face to the King’s.

As reported by the ABC, with an estimated 27 billion coins in circulation, the Royal Mint has announced it will take “many years” for currencies with the Queen’s likeness on them to be phased out.

“The first coins bearing the effigy of His Majesty King Charles III will enter circulation in line with demand from banks and post offices,” the Royal Mint’s chief executive Anne Jessopp said.

“This means the coinage of King Charles III and Queen Elizabeth II will co-circulate in the UK for many years to come.”

The Royal Mail has said stamps with His Majesty’s face printed on them will be circulated once the stamps in stock are sold out.

The announcement was met with mixed reactions from the public, with many still in mourning for the loss of Her Majesty.

Earlier in the week, on September 25, the Palace released an image of the King receiving his Red Box, containing important documents from the realms, that were received almost daily by Queen Elizabeth during her impressive 70-year reign.

All coins, banknotes and stamps bearing the Queen’s likeness are still valid for use.