Ledger Seed Phrase Bip39. From this place ahead the seed can be published on paper or spoken over phone which opened up new, physical means of backing up the seed (a number of paper copies in various locations, tough copies on metallic plates with more protection from fireplace/flood etcetera.). While https://wise-social.com/story4065052/bip39-words-list-bip39-mnemonic-to-private-key-fundamentals-explained