In the interests of completeness…
The first 2 letters of the code are the ISO 2-character country code and the third is (usually) the initial of the currency itself. so for example CH - for Confoederatio Helvetica, ie. Switzerland, and F for Franc gives CHF, the Swiss Franc.

It’s all there in ISO 4217, if you really need more information…

AFA - Afghanistan Afghani
ALL - Albanian Lek
DZD - Algerian Dinar
ARS - Argentine Peso
AWG - Aruba Florin
AUD - Australian Dollar
BSD - Bahamian Dollar
BHD - Bahraini Dinar
BDT - Bangladesh Taka
BBD - Barbados Dollar
BZD - Belize Dollar
BMD - Bermuda Dollar
BTN - Bhutan Ngultrum
BOB - Bolivian Boliviano
BWP - Botswana Pula
BRL - Brazilian Real
GBP - British Pound
BND - Brunei Dollar
BIF - Burundi Franc
KHR - Cambodia Riel
CAD - Canadian Dollar
CVE - Cape Verde Escudo
KYD - Cayman Islands Dollar
CLP - Chilean Peso
CNY - Chinese Yuan
COP - Colombian Peso
KMF - Comoros Franc
CRC - Costa Rica Colon
HRK - Croatian Kuna
CUP - Cuban Peso
CYP - Cyprus Pound
CZK - Czech Koruna
DKK - Danish Krone
DJF - Dijibouti Franc
DOP - Dominican Peso
XCD - East Caribbean Dollar
EGP - Egyptian Pound
SVC - El Salvador Colon
EEK - Estonian Kroon
ETB - Ethiopian Birr
EUR - Euro
FKP - Falkland Islands Pound
GMD - Gambian Dalasi
GHC - Ghanian Cedi
GIP - Gibraltar Pound
GTQ - Guatemala Quetzal
GNF - Guinea Franc
GYD - Guyana Dollar
HTG - Haiti Gourde
HNL - Honduras Lempira
HKD - Hong Kong Dollar
HUF - Hungarian Forint
ISK - Iceland Krona
INR - Indian Rupee
IDR - Indonesian Rupiah
IQD - Iraqi Dinar
ILS - Israeli Shekel
JMD - Jamaican Dollar
JPY - Japanese Yen
JOD - Jordanian Dinar
KZT - Kazakhstan Tenge
KES - Kenyan Shilling
KRW - Korean Won
KWD - Kuwaiti Dinar
LAK - Lao Kip
LVL - Latvian Lat
LBP - Lebanese Pound
LSL - Lesotho Loti
LRD - Liberian Dollar
LYD - Libyan Dinar
LTL - Lithuanian Lita
MOP - Macau Pataca
MKD - Macedonian Denar
MGF - Malagasy Franc
MWK - Malawi Kwacha
MYR - Malaysian Ringgit
MVR - Maldives Rufiyaa
MTL - Maltese Lira
MRO - Mauritania Ougulya
MUR - Mauritius Rupee
MXN - Mexican Peso
MDL - Moldovan Leu
MNT - Mongolian Tugrik
MAD - Moroccan Dirham
MZM - Mozambique Metical
MMK - Myanmar Kyat
NAD - Namibian Dollar
NPR - Nepalese Rupee
ANG - Neth Antilles Guilder
NZD - New Zealand Dollar
NIO - Nicaragua Cordoba
NGN - Nigerian Naira
NOK - Norwegian Krone
OMR - Omani Rial
XPF - Pacific Franc
PKR - Pakistani Rupee
XPD - Palladium Ounces
PAB - Panama Balboa
PGK - Papua New Guinea Kina
PYG - Paraguayan Guarani
PEN - Peruvian Nuevo Sol
PHP - Philippine Peso
XPT - Platinum Ounces
PLN - Polish Zloty
QAR - Qatar Rial
ROL - Romanian Leu
RUB - Russian Rouble
WST - Samoa Tala
STD - Sao Tome Dobra
SAR - Saudi Arabian Riyal
SCR - Seychelles Rupee
SLL - Sierra Leone Leone
XAG - Silver Ounces
SGD - Singapore Dollar
SKK - Slovak Koruna
SIT - Slovenian Tolar
SBD - Solomon Islands Dollar
SOS - Somali Shilling
ZAR - South African Rand
LKR - Sri Lanka Rupee
SHP - St Helena Pound
SDD - Sudanese Dinar
SRG - Surinam Guilder
SZL - Swaziland Lilageni
SEK - Swedish Krona
TRY - Turkey Lira
CHF - Swiss Franc
SYP - Syrian Pound
TWD - Taiwan Dollar
TZS - Tanzanian Shilling
THB - Thai Baht
TOP - Tonga Pa’anga
TTD - Trinidad & Tobago Dollar
TND - Tunisian Dinar
TRL - Turkish Lira
USD - U.S. Dollar
AED - UAE Dirham
UGX - Ugandan Shilling
UAH - Ukraine Hryvnia
UYU - Uruguayan New Peso
VUV - Vanuatu Vatu
VEB - Venezuelan Bolivar
VND - Vietnam Dong
YER - Yemen Riyal
YUM - Yugoslav Dinar
ZMK - Zambian Kwacha
ZWD - Zimbabwe Dollar