Bip39 Seed Word List. From this level forward the seed may be composed on paper or spoken in excess of telephone and this opened up new, physical ways of backing up the seed (various paper copies in several locations, sturdy copies on metallic plates with additional defense from fire/flood etcetera.). https://finance-bank03692.wikiap.com/1109597/the_anatomy_of_a_bip39_phrase_entropy_terms_and_security