Русско-англо-русский юридический словарь

The head of state is the highest-ranking constitutional position[note 1] in a sovereign state. The head of state is vested with powers to act as the chief public representative of that state. Heads of state in most countries are natural persons holding an office. In a monarchy the reigning monarch is the head of state, though the title may not be king or queen. In a republic the head of state is usually titled president, but may have other titles such as chairman. (Wikipedia)

National coat of arms is a symbol which denotes an independent state in the form of a heraldic achievement. While a national flag usually is being used by common people and is flown outside and on ships, the national coat of arms is normally seen as the symbol of the government or in monarchies even rather for the head of state personally and used in print and on porcelain and as wall decorations in parliamentary buildings. (Wikipedia)

Advisory council may refer to: Privy council, a body that advises the head of state of a nation, typically, but not always, in the context of a monarchic government (Wikipedia)

A national coat of arms is a symbol which denotes an independent state in the form of a heraldic achievement. While a national flag is usually used by the population at large and is flown outside and on ships, a national coat of arms is normally considered a symbol of the government or (especially in monarchies) the head of state personally and tends to be used in print, on heraldic china, and as a wall decoration in official buildings. [...]

For a symbol to be called a "national coat of arms", it should follow the rules of heraldry. If it does not, then the symbol is not formally a coat of arms but rather a national emblem. However, many unheraldic national emblems are colloquially called national coats of arms anyway, because they are used for the same purposes as national coats of arms. (Wikipedia)