Abstract Syntax Notation One (ASN.1)
ASN.1 is a standard language for describing data structures so that they can be encoded and exchanged between different systems.
What is Abstract Syntax Notation One (ASN.1)?
Defined by ITU-T and ISO, it is widely used in telecoms signalling (such as LTE and 5G radio protocols), certificates and smart cards, with encoding rules such as BER, DER and PER.