1. The distinguishing sign shall be composed of one to three letters in capital Latin characters. The letters shall have a minimum height of 80 mm (3.1 in.) and their strokes a width of 10 mm (0.4 in.) The letters shall be painted in black on a white ground of elliptical form with the major axis horizontal.

2. If the distinguishing sign is composed of three letters, the dimensions of she ellipse shall be at least 240 mm (9.4 in.) in width and 145 mm (5.7 in.) in height The dimensions may be reduced to 175 mm (6.9 in.) in width and 215 mm (4.5 in.) in height if the sign carries less than three letters.
As regards the distinguishing signs for motorcycles, the dimensions of the ellipse, whether the sign is composed of one, two or three letters, may be reduced to 175 mm (6.9 in.) in width and 115 mm (4.5 in.) in height.

3. The distinctive letters for the differen States and territories are as follows:


 

Andorra AND
Algeria
 DZ
Argentina RA
Australia
 AUS
Austria
 A
Barbados
 BDS
Belgium
 B
Botswana
 RB
Brazil
 BR
Bulgaria
 BG
Burma
 BUR
Cambodia K
Canada
 CDN
Central African Repablic
 RCA
Ceylon
 CL
Chile
 RCH
China
 RC
Congo (Brazzaville)
 RCB
Congo (Dem. Rep. of)
 CGO
Costa Rica
 CR
Cyprus
 CY
Czechoslovakia
 CS
Dahoney
 DY
Denmark
 DK
Dominican Republic
 DOM
Ecuador
 EC
Finland
 SF
France
 F
French Overseas Territories
 F
Gambia
 WAG
Ghana
 GH
Greece
 RG
Guatemala
 GCA
Haiti
 RH
Holy See    
 V
Hungary
 H
Iceland 
  IS
India
 IND
Indonesia
 RI
Iran
 IR
Ireland
 IRL
Israel
 IL
Italy
 I
Ivory Coast
 Cl
Jamaica
 JA
Japan
 J
Jordan HKJ
Kenya
 EAK
Laos
 LAO
Lebanon
 RL
Lesotho
 LS
Luxembourg 
 L
Madagascar
 RM
Malawi
 MW
Malaysia
 PTM
Mali RMM
Malta
 M
Mexico
 MEX
Monaco
 MC
Morocco
 MA
Netherlands
 NL
Surinam 
 SME
Netherlands Antilles
 NA
New Zealand
 NZ
Nicaragua
 NIC
Niger 
 NIG
Nigeria
 WAN
Norway 
 N
Pakistan
 PAK
Paraguay
 PY
Pery
 PE
Philippines
 PI
Poland
 PO
Portugal 
 P
Romania
 R
Rwanda
 RWA
San Marino
 RSM
Senegal
 SN
Sierra Leone WAL
Singapore
 SGP
South Africa
 ZA
Spain
 E
African localities and provinces
 E
Sweden 
 S
Switzerland
 CH
Syria 
 SYR
Thailand
 T
Togo TG
Trinidad and Tobago TT
Tunisia
 TN
Turkey
 TR
Uganda EAU
Union of Soviet Socialist
Republics
 SU
United Arab Republic 
 ET
United Kingdom
 GB
Aden
 ADN
Alderney 
 GBA
Bahamas
 BS
British Honduras 
 BH
Brunei 
 BRU
Guernsey
 GBG
Gibraltar 
 GBZ
Jersey 
 GBJ
Hong Kong HK
Mauritius
 MS
Province Wellesley 
 SS
Seychelles
 SY
Southern Rhodesia
 RSR
Swaziland    
 SD
Grenada 
 WG
St. Lucia
 WL
St. Vincent
 WV
Tanganyika
 EAT
Zanzibar 
 EAZ
United States of America
 USA
Uruguay
 U
Venezuela 
 YV
Viet-Nam (Republic of)
 VN
Western Samoa
 WS
Yugoslavia 
 YU
Zambia
 RNR


Any State which has not already done so shall on signature or ratification of, or accession to, this Convention, notify the Secretary- General of the distinctive letters selected by that State.

4. When the distinguishing sign is carried on a special plate this plate shall be fixed in a vertical or nearly vertical position and in a plane perpendicular to the longitudinal axis of the vehicle itself. When the sign is fixed to or painted on the vehicle itself, this shall be done on a vertical or nearly vertical surface at the back of the vehicle.


 Convention of Road Traffic signed at Geneva September, 19 1949 (English)