All ISO-2 Country Codes

- Chad: TD, from Tchad, the French name for the country

- Comoros: KI, from Komori, the Comorian name for the country

- Croatia: HR, from Hrvatska, the Croatian name for the country

- East Timor: TL, from Timor-Leste, the shortened official name for the country

- Equatorial Guinea: GQ, from Guinée équatoriale, the French name for the country

- Estonia: EE, from Eesti, the Estonian name for the country

- Eswatini: SZ, kept after a name change from Swaziland

- F.S. Micronesia: FS. Matches the name used here, but not the commonly used name of Micronesia

- Germany: DE, from Deutschland, the German name for the country (and transferred from previous usage by West Germany)

- Guinea Bissau: GW. There is no official explanation I could find on why it is as such, but I assume it's because other valid codes (GU, GI, GN, GE, GA, GB, GS and GU) were already taken by other countries/territories and this was the closest unassigned code.

- Iceland: IS, from Ísland, the Icelandic name for the country

- Myanmar: MM. Matches the name used but not of the commonly used name of Burma (from which the country was referred to before its current name)

- North Korea: KP, from Korea, Democratic People's Republic of, the country's UN designated name (its official name is similar and abbreviated as DPRK with "Korea" at the end)

- North Macedonia: MK, from Makedonija, the Macedonian for the country (and previously used by the country when it was still just called "Macedonia")

- Palau: PW. There is no official explanation I could find, but I assume it's because other valid codes (PA, PL and PU; the latter was in use and eventually deleted after PW was assigned) were already taken by other countries/territories and this was the closest unassigned code.

- South Korea: KR, from Korea, the Republic of, the country's UN designated name (its official name is similar and abbreviated as ROK with "Korea" at the end)

- Samoa: WS, kept after a name change from Western Samoa (a name used to differentiate the country from the US territory of American Samoa)

- Serbia: RS, from Republic of Serbia or Republika Srbija, the official names for the country in English and Serbian

- Solomon Islands: SB, kept after a name change from British Solomon Islands (with potential codes probably being taken for the old name before assigning to SB)

- South Africa: ZA, from Zuid-Afrika, the Dutch name for the country (Dutch was an official language in the country until 1961 and the Afrikaans name of Suid-Afrika had its potential codes already in use)

- Spain: ES, from España, the Spanish name for the country

- Switzerland: CH, from Confoederatio Helvetica, the Latin name for the country (used as a neutral name for the country rather than its name in one of its official language)

- UK: GB, from "Great Britain", a shortened version of the UN designated United Kingdom of Great Britain and Northern Ireland, the (official name is similar just with "the" in the front)

- Vatican City: VA. Matches the name used but not the official UN designation of Holy See, the - referring to the governing body/entity that represents the Vatican internationally

Some other countries may have unexpected codes were probably given codes that weren't their 1st option (e.g. LK for Sri Lanka)

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