Question: What is featured on the British decimal twenty pence coin that in banner form is know as the "Royal Standard"?

Context articles: Royal coat of arms of the United Kingdom
Ten pence (British coin)
Five pence (Irish coin)
Two pence (British decimal coin)
Five pence (British coin)
Fifty pence (British coin)
Twenty pence (British coin)
Twenty pence (Irish coin)
Penny (Irish decimal coin)
British twenty-five pence coin

The royal coat of arms of the United Kingdom, or the Royal Arms for short, is the official coat of arms of the British monarch, currently Queen Elizabeth II.
 These arms are used by the Queen in her official capacity as monarch of the United Kingdom.
 Variants of the Royal Arms are used by other members of the British royal family; and by the British government in connection with the administration and government of the country.
 In Scotland, there exists a separate version of the Royal Arms, a variant of which is used by the Scotland Office.
 The arms in banner form serve as basis for the monarch's official flag, known as the "Royal Standard".
The British decimal ten pence (10p) coin – often pronounced "ten pee" – is a unit of currency equalling ten one-hundredths of a pound sterling.
 Its obverse has featured the profile of Queen Elizabeth II since the coin's introduction in 1968, replacing the two shilling coin in preparation for decimalisation in 1971.
 Four different portraits of the Queen have been used on the coin, with the latest design by Jody Clark being introduced in 2015.
 The second and current reverse, featuring a segment of the Royal Shield, was introduced in 2008.
The five pence (5p) (Irish: "cúig phingin" ) coin was a subdivision of the Irish pound.
 It was introduced in Ireland on Decimal Day, 15 February 1971 and reused the design on the shilling coin produced for the Irish Free State in 1928.
 Some shilling coins remained in circulation until the early 1990s, with the same nominal value as the five pence coin.
The British decimal two pence (2p) coin – often pronounced "two pee" – is a unit of currency equaling two one-hundredths of a pound sterling.
 Its obverse has featured the profile of Queen Elizabeth II since the coin’s introduction on 15 February 1971, the year British currency was decimalised.
 Four different portraits of the Queen have been used on the coin, with the latest design by Jody Clark being introduced in 2015.
 The second and current reverse, featuring a segment of the Royal Shield, was introduced in 2008.
The British decimal five pence (5p) coin – often pronounced "five pee" – is a unit of currency equaling five one-hundredths of a pound sterling.
 Its obverse has featured the profile of Queen Elizabeth II since the coin’s introduction on 23rd April 1968, replacing the shilling in preparation for decimalisation in 1971.
 A smaller version of the coin was introduced in June 1990 with the older coins being withdrawn on 31st December 1990.
 Four different portraits of the Queen have been used, with the latest design by Jody Clark being introduced in 2015.
 The second and current reverse, featuring a segment of the Royal Shield, was introduced in 2008.
The British decimal fifty pence (50p) coin – often pronounced "fifty pee" – is a unit of currency equaling one half of a pound sterling.
 It is a seven-sided coin formed as an equilateral-curve heptagon, or Reuleaux polygon, a curve of constant width, meaning that the diameter is constant across any bisection.
 Its obverse has featured the profile of Queen Elizabeth II since the coin’s introduction in 1969.
 Four different portraits of the Queen have been used, with the latest design by Jody Clark being introduced in 2015.
 The second and current reverse, featuring a segment of the Royal Shield, was introduced in 2008.
The British decimal twenty pence (20p) coin – often pronounced "twenty pee" – is a unit of currency equal to 20/100 of a pound sterling.
 Like the 50p coin, it is an equilateral curve heptagon.
 Its obverse has featured the profile of Queen Elizabeth II since the coin's introduction on June 9th 1982.
 Four different portraits of the Queen have been used; the latest design by Jody Clark was introduced in 2015.
 The second and current reverse (as of 2017), featuring a segment of the Royal Shield, was introduced in 2008.
The twenty pence (20p) (Irish: "fiche pingin" ) coin was a subdivision of the Irish pound.
 It was introduced on 30 October 1986.
 It was first Irish decimal coin that was of a different size to the corresponding British coin, as the Irish pound had not been pegged to the British pound since 1979.
 Its last issue was in 2000, two years before Ireland withdrew its pound for the euro.
The decimal one penny (1p) (Irish: "pingin" ) coin was the second smallest denomination of the Irish pound.
 It was first issued when the Irish currency was decimalised on Decimal Day, 15 February 1971.
 It was the second of three new designs introduced all in bronze, the others being a half-penny and a two pence coin.
 All featured ornamental birds designed by Irish artist Gabriel Hayes on the reverse.
The commemorative British decimal twenty-five pence (25p) coin was issued in four designs between 1972 and 1981.
 These coins were a post-decimalisation continuation of the traditional crown, with the same value of a quarter of a pound sterling.
 Uniquely in British decimal coinage, the coins do not have their value stated on them.
 This is because previous crowns rarely did so.