Encoded information in column 13 could denote supplementary remarks about the encoding method or content of a message, whether it's a binary sequence for data transmission or details of an interstellar message intended for extraterrestrial life.
Encoded information in column 13 could refer to additional remarks or data about the method or content of a message when discussing signal transmissions. For example, when talking about signals such as those from cell phones or computers, which use binary sequences to encode data, column 13 could include remarks on the type of encoding, compression used, or specifics about the data content.
In the context of interstellar messages, as mentioned in the provided information, remarks in column 13 might indicate details about the origin or intended interpretation of the message, as per the examples given of the Pioneer and Voyager spacecraft, which carry symbolic messages intended for potential extraterrestrial life. Considering the complexity of decoding a message from an alien species, which might be beyond our current comprehension, column 13 could also contain assumptions or interpretations made by researchers about the extraterrestrial signal.