These are the ISO 3166 standard country codes, that, for example, all country-specific TLD's are named after.

ISO 3166 as of 1997-07-14, listed alphabetically by name:
Two     Three   Number  Name
AF      AFG     004     Afghanistan
AL      ALB     008     Albania
DZ      DZA     012     Algeria
AS      ASM     016     American Samoa
AD      AND     020     Andorra
AO      AGO     024     Angola
AI      AIA     660     Anguilla
AQ      ATA     010     Antarctica
AG      ATG     028     Antigua and Barbuda
AR      ARG     032     Argentina
AM      ARM     051     Armenia
AW      ABW     533     Aruba
AU      AUS     036     Australia
AT      AUT     040     Austria
AZ      AZE     031     Azerbaijan
BS      BHS     044     Bahamas
BH      BHR     048     Bahrain
BD      BGD     050     Bangladesh
BB      BRB     052     Barbados
BY      BLR     112     Belarus
BE      BEL     056     Belgium
BZ      BLZ     084     Belize
BJ      BEN     204     Benin
BM      BMU     060     Bermuda
BT      BTN     064     Bhutan
BO      BOL     068     Bolivia
BA      BIH     070     Bosnia and Herzegowina
BW      BWA     072     Botswana
BV      BVT     074     Bouvet Island
BR      BRA     076     Brazil
IO      IOT     086     British Indian Ocean Territory
BN      BRN     096     Brunei Darussalam
BG      BGR     100     Bulgaria
BF      BFA     854     Burkina Faso
BI      BDI     108     Burundi
KH      KHM     116     Cambodia
CM      CMR     120     Cameroon
CA      CAN     124     Canada
CV      CPV     132     Cape Verde
KY      CYM     136     Cayman Islands
CF      CAF     140     Central African Republic
TD      TCD     148     Chad
CL      CHL     152     Chile
CN      CHN     156     China
CX      CXR     162     Christmas Island
CC      CCK     166     Cocos (Keeling) Islands
CO      COL     170     Colombia
KM      COM     174     Comoros
CG      COG     178     Congo (Rep.)
CD      COD     180     Congo (Dem. Rep.)
CK      COK     184     Cook Islands
CR      CRI     188     Costa Rica
CI      CIV     384     Cote d'Ivoire
HR      HRV     191     Croatia
CU      CUB     192     Cuba
CY      CYP     196     Cyprus
CZ      CZE     203     Czech Republic
DK      DNK     208     Denmark
DJ      DJI     262     Djibouti
DM      DMA     212     Dominica
DO      DOM     214     Dominican Republic
TP      TMP     626     East Timor
EC      ECU     218     Ecuador
EG      EGY     818     Egypt
SV      SLV     222     El Salvador
GQ      GNQ     226     Equatorial Guinea
ER      ERI     232     Eritrea
EE      EST     233     Estonia
ET      ETH     231     Ethiopia
FK      FLK     238     Falkland Islands
FO      FRO     234     Faroe Islands
FJ      FJI     242     Fiji
FI      FIN     246     Finland
FR      FRA     250     France
FX      FXX     249     France, Metropolitan
GF      GUF     254     French Guiana
PF      PYF     258     French Polynesia
TF      ATF     260     French Southern Territories
GA      GAB     266     Gabon
GM      GMB     270     Gambia
GE      GEO     268     Georgia
DE      DEU     276     Germany
GH      GHA     288     Ghana
GI      GIB     292     Gibraltar
GR      GRC     300     Greece
GL      GRL     304     Greenland
GD      GRD     308     Grenada
GP      GLP     312     Guadeloupe
GU      GUM     316     Guam
GT      GTM     320     Guatemala
GN      GIN     324     Guinea
GW      GNB     624     Guinea-Bissau
GY      GUY     328     Guyana
HT      HTI     332     Haiti
HM      HMD     334     Heard and McDonald Islands
HN      HND     340     Honduras
HK      HKG     344     Hong Kong
HU      HUN     348     Hungary
IS      ISL     352     Iceland
IN      IND     356     India
ID      IDN     360     Indonesia
IR      IRN     364     Iran
IQ      IRQ     368     Iraq
IE      IRL     372     Ireland
IL      ISR     376     Israel
IT      ITA     380     Italy
JM      JAM     388     Jamaica
JP      JPN     392     Japan
JO      JOR     400     Jordan
KZ      KAZ     398     Kazakhstan
KE      KEN     404     Kenya
KI      KIR     296     Kiribati
KP      PRK     408     Korea (Democratic People's Republic of)
KR      KOR     410     Korea (Republic of)
KW      KWT     414     Kuwait
KG      KGZ     417     Kyrgyzstan
LA      LAO     418     Lao People's Democratic Republic
LV      LVA     428     Latvia
LB      LBN     422     Lebanon
LS      LSO     426     Lesotho
LR      LBR     430     Liberia
LY      LBY     434     Libyan Arab Jamahiriya
LI      LIE     438     Liechtenstein
LT      LTU     440     Lithuania
LU      LUX     442     Luxembourg
MO      MAC     446     Macau
MK      MKD     807     Macedonia (The Former Yugoslav Republic of)
MG      MDG     450     Madagascar
MW      MWI     454     Malawi
MY      MYS     458     Malaysia
MV      MDV     462     Maldives
ML      MLI     466     Mali
MT      MLT     470     Malta
MH      MHL     584     Marshall Islands
MQ      MTQ     474     Martinique
MR      MRT     478     Mauritania
MU      MUS     480     Mauritius
YT      MYT     175     Mayotte
MX      MEX     484     Mexico
FM      FSM     583     Micronesia (Federated States of)
MD      MDA     498     Moldova
MC      MCO     492     Monaco
MN      MNG     496     Mongolia
MS      MSR     500     Montserrat
MA      MAR     504     Morocco
MZ      MOZ     508     Mozambique
MM      MMR     104     Myanmar
NA      NAM     516     Namibia
NR      NRU     520     Nauru
NP      NPL     524     Nepal
NL      NLD     528     Netherlands
AN      ANT     530     Netherlands Antilles
NC      NCL     540     New Caledonia
NZ      NZL     554     New Zealand
NI      NIC     558     Nicaragua
NE      NER     562     Niger
NG      NGA     566     Nigeria
NU      NIU     570     Niue
NF      NFK     574     Norfolk Island
MP      MNP     580     Northern Mariana Islands
NO      NOR     578     Norway
OM      OMN     512     Oman
PK      PAK     586     Pakistan
PW      PLW     585     Palau
PS      PSE     999     Palestine
PA      PAN     591     Panama
PG      PNG     598     Papua-New Guinea
PY      PRY     600     Paraguay
PE      PER     604     Peru
PH      PHL     608     Philippines
PN      PCN     612     Pitcairn
PL      POL     616     Poland
PT      PRT     620     Portugal
PR      PRI     630     Puerto Rico
QA      QAT     634     Qatar
RE      REU     638     Reunion
RO      ROM     642     Romania
RU      RUS     643     Russian Federation
RW      RWA     646     Rwanda
KN      KNA     659     Saint Kitts and Nevis
LC      LCA     662     Saint Lucia
VC      VCT     670     Saint Vincent and the Grenadines
WS      WSM     882     Samoa
SM      SMR     674     San Marino
ST      STP     678     Sao Tome and Principe
SA      SAU     682     Saudi Arabia
SN      SEN     686     Senegal
SC      SYC     690     Seychelles
SL      SLE     694     Sierra Leone
SG      SGP     702     Singapore
SK      SVK     703     Slovakia
SI      SVN     705     Slovenia
SB      SLB     090     Solomon Islands
SO      SOM     706     Somalia
ZA      ZAF     710     South Africa
GS      SGS     239     South Georgia and the South Sandwich Islands
ES      ESP     724     Spain
LK      LKA     144     Sri Lanka
SH      SHN     654     St. Helena
PM      SPM     666     St. Pierre and Miquelon
SD      SDN     736     Sudan
SR      SUR     740     Suriname
SJ      SJM     744     Svalbard and Jan Mayen Islands
SZ      SWZ     748     Swaziland
SE      SWE     752     Sweden
CH      CHE     756     Switzerland
SY      SYR     760     Syrian Arab Republic
TW      TWN     158     Taiwan
TJ      TJK     762     Tajikistan
TZ      TZA     834     Tanzania
TH      THA     764     Thailand
TG      TGO     768     Togo
TK      TKL     772     Tokelau
TO      TON     776     Tonga
TT      TTO     780     Trinidad and Tobago
TN      TUN     788     Tunisia
TR      TUR     792     Turkey
TM      TKM     795     Turkmenistan
TC      TCA     796     Turks and Caicos Islands
TV      TUV     798     Tuvalu
UG      UGA     800     Uganda
UA      UKR     804     Ukraine
AE      ARE     784     United Arab Emirates
GB      GBR     826     United Kingdom
US      USA     840     United States
UM      UMI     581     United States Minor Outlying Islands
UY      URY     858     Uruguay
UZ      UZB     860     Uzbekistan
VU      VUT     548     Vanuatu
VA      VAT     336     Vatican City State
VE      VEN     862     Venezuela
VN      VNM     704     Viet Nam
VG      VGB     092     Virgin Islands (British)
VI      VIR     850     Virgin Islands (U.S.)
WF      WLF     876     Wallis and Futuna Islands
EH      ESH     732     Western Sahara
YE      YEM     887     Yemen
YU      YUG     891     Yugoslavia
ZM      ZMB     894     Zambia
ZW      ZWE     716     Zimbabwe

All top-level country domains are named this way except for the domain of
the United Kingdom, which is .uk rather than the GB
which inexplicably is their country code, as if they were that place known
as Great Britain.

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