The nwn m gesture of pulling the front lock of hair.
As we can see in the graphic here below the nwn m gesture of pulling hair is very present in the Old Kingdom, while we have no documents of it from the Middle Kingdom. It appears again later and especially strong in iconography. Documents from the Late Period on are less.
Which ideas can we take from?

Nephtys pulling her front lock of hair. Detail from the sarcophagus of Nesshutefnut from the Ptolemaic Period. Kunsthistorisches Museum Wien. http://www.khm.at
- If we have to take notice just of the data, we could understand that the nwn m gesture disappears during the Middle Kingdom for appearing again in the New Kingdom, but does it make sense? We think the answer is no. In this case we guess we have to hold chance responsible again for it.
- Maybe the point is that such a sacred practice had not an orthodox way of being expressed, or in religious texts, or in iconography. Once in the New Kingdom the decorative activity gets so intense and sacred texts increase little by little religious and artistic collectives establish some rules or some principles. From that moment on we can distinguish between the common mourners and the professional ones, both making similar gestures, but with different meanings and in different moments of the funerary ceremony.