BERT-RPC tag should be used when question is related to the Binary ERlang Term data interchange format (BERT) and it's protocol (RPC). Do note: that the bert-toolkit is another library it is not related to this.
BERT aims to be as simple as possible while maintaining support for the advanced data types we have come to know and love. BERT-RPC is designed to work seamlessly within a dynamic/agile development workflow. The BERT-RPC philosophy is to eliminate extraneous type checking, IDL specification, and code generation. This frees the developer to actually get things done.
BERT (Binary ERlang Term) is a flexible binary data interchange format based on (and compatible with) Erlang's binary serialization format (as used by erlang:term_to_binary/1). BERT supports the following simple data types (shown here using Erlang syntax):
(taken from the project homepage)