.UK is the internet top-level domain for the United Kingdom, which includes England, Scotland, Wales, and Northern Ireland.
In most cases, the Internet domain is the same as the ISO code used for things like currencies, but the UK is an exception. For purposes other than the Internet, the UK uses ISO code GB, as in the currency code GBP.
Scotland does not have its own two-letter ISO country code. It uses UK for the Internet and GB for all other purposes (for example, currency code GBP for UK pounds sterling).
UK
No one uses that code to dial the UK, which is country code +44, not +55. '00' is a commonly used international access prefix, and +55 is the country code for Brazil.
Australia uses country code +61, dialled as 0061 from the UK.
Australia uses country code +61. From the UK, dial 00 61 then the full Australian number minus any leading zero.
The three-letter country code for passports issued by the Republic of Ireland is IRL.
The UK pound is another name for the British Pound(symbol: £, code: GBP). It is used by the United Kingdom, and by most UK overseas territories.
GIB is the ISO 3166-1 alpha-3 code for Gibraltar, a UK territory adjacent to the southern tip of Spain. The telephone country code is +350, and the Internet domain is .gi
Yes, country code top-level domains are assigned based on ISO-3166 country codes, which are protected globally. (Except that the United Kingdom uses .uk instead of its ISO-3166 code of .gb; however, the ISO has agreed not to assign UK as an ISO-3166 code.)
The country code and area code of Aberdeen, United Kingdom is 44, (0)1224.
The country code for the UK is +44. The plus sign means "insert your international access prefix here."
Country code +44 is the UK; 74 is probably a mobile.