A more thorough explanation:

CXT

CXT is an abbreviation for "common external tariff" which is a type of tariff that is applied uniformly by a group of countries to goods imported from countries outside of that group.

For example, the member countries of the European Union have a common external tariff on goods imported from countries outside of the EU. This means that if a product is imported into any EU country from a non-EU country, it will be subject to the same tariff rate regardless of which EU country it enters first.

Another example is the Southern African Customs Union (SACU), which has a common external tariff on goods imported from countries outside of the SACU. This means that if a product is imported into any of the SACU member countries (Botswana, Lesotho, Namibia, South Africa, and Eswatini) from a non-SACU country, it will be subject to the same tariff rate regardless of which SACU country it enters first.

The examples illustrate how a common external tariff works in practice. In both cases, a group of countries has agreed to apply the same tariff rate to goods imported from countries outside of that group. This helps to create a level playing field for trade between the member countries and ensures that non-member countries are not able to gain an unfair advantage by exporting goods to one member country with a lower tariff rate and then re-exporting them to another member country with a higher tariff rate.