It is possible that H. erectus or other archaic humans used a form of sign language, but there is no direct evidence to support this. However, it's interesting to note that H. erectus fossils have been found with deformities that could have made it difficult for them to use conventional forms of communication, like speech or facial expressions. This has led some scientists to suggest that they may have developed a form of sign language to compensate for their limited ability to communicate verbally or non-verbally.