How to Say "ciphers" in Spanish
The Spanish word for “ciphers” is “códigos” — A2 level. This is a very common word in everyday Spanish.
English → SpanishA2
nounA2
secret writing systems

Examples
Necesitas los códigos postales para enviar el paquete.
You need the postal codes (zip codes) to send the package.
Por favor, introduce los códigos de acceso para entrar al sistema.
Please enter the access codes to enter the system.
Los códigos QR facilitan la conexión a internet.
QR codes make it easier to connect to the internet.
Referring to Numbers
When talking about identification numbers (like PINs or zip codes), 'códigos' is the standard word, much like 'codes' in English.
Related Translations
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