--- title: "BIP39 Word #723: fog — Seed Phrase Mnemonic Word" url: "https://bip39-phrase.com/bip39-word/fog/" language: "en" updated: "2026-10-19T00:00:00+00:00" --- Word #723 01011010010 # fog — BIP39 word #723 "**fog**" is word #723 of the 2048 words in the official BIP39 English wordlist, between [focus](/bip39-word/focus/) and [foil](/bip39-word/foil/). In a seed phrase it stands for the 11-bit value `01011010010`, decimal index 722\. /fɒg/ · _noun:_ a thick cloud of water droplets near the ground that limits vision [Russian](/ru/ "The BIP39 wordlist with Russian translations"): туман ## Binary Representation Five 1-bits and six 0-bits; 462 of the 2048 indexes have exactly five 1-bits. One wrong bit turns it into (leftmost bit first): [surge](/bip39-word/surge/)[bottom](/bip39-word/bottom/)[kid](/bip39-word/kid/)[engage](/bip39-word/engage/)[false](/bip39-word/false/)[furnace](/bip39-word/furnace/)[flame](/bip39-word/flame/)[forget](/bip39-word/forget/)[food](/bip39-word/food/)[foam](/bip39-word/foam/)[foil](/bip39-word/foil/) Position Hex Index 0x2D2 4-Letter Prefix fog ## About "fog" in BIP39 - It takes all three letters to identify "fog": **"fo"** also begins 18 other words, among them [foam](/bip39-word/foam/), [focus](/bip39-word/focus/), [foil](/bip39-word/foil/) and [fold](/bip39-word/fold/). Three letters are enough for only 604 of the 2048 words. - "fog" appears in one of the 24 official English [test vectors](https://github.com/trezor/python-mnemonic/blob/master/vectors.json) of BIP39: vector #14 (word 18 of 18). Every official vector passes the [checksum checker](/bip39-checksum-checker/), and [How BIP39 works](/how-bip39-works/) shows how the entropy turns into such words. As the last word of vector #14, its final 6 bits, **010010**, are the checksum of the 18-word phrase. Official test vector #14 [gravity](/bip39-word/gravity/) [machine](/bip39-word/machine/) [north](/bip39-word/north/) [sort](/bip39-word/sort/) [system](/bip39-word/system/) [female](/bip39-word/female/) [filter](/bip39-word/filter/) [attitude](/bip39-word/attitude/) [volume](/bip39-word/volume/) [fold](/bip39-word/fold/) [club](/bip39-word/club/) [stay](/bip39-word/stay/) [feature](/bip39-word/feature/) [office](/bip39-word/office/) [ecology](/bip39-word/ecology/) [stable](/bip39-word/stable/) [narrow](/bip39-word/narrow/) fog ## Word #723 in the Other 9 BIP39 Wordlists [Czech](/czech/) ladnost [French](/french/) esprit [Italian](/italian/) galateo [Japanese](/japanese/) さくし [Korean](/korean/) 비닐 [Portuguese](/portuguese/) envolver [Spanish](/spanish/) fingir [Traditional Chinese](/chinese-traditional/) 移 [Simplified Chinese](/chinese-simplified/) 移 ## Similar Words — Check Carefully During Recovery 3 BIP39 words differ from "fog" by just a single letter — the most common source of typos when a seed phrase is entered by hand: [dog](/bip39-word/dog/)[fox](/bip39-word/fox/)[frog](/bip39-word/frog/) ## More BIP39 Words Starting with "F" [ #719 flush ](/bip39-word/flush/)[ #720 fly ](/bip39-word/fly/)[ #721 foam ](/bip39-word/foam/)[ #722 focus ](/bip39-word/focus/)[ #724 foil ](/bip39-word/foil/)[ #725 fold ](/bip39-word/fold/)[ #726 follow ](/bip39-word/follow/)[ #727 food ](/bip39-word/food/) [View all words starting with "F" ](/bip39-words/f/) ## Seed phrase, key and recovery guides - [BIP39 Passphrase: How the 25th Word Creates a Hidden Wallet](/bip39-passphrase/) - [Is My Seed Phrase Compromised? Signs and What to Do Next](/bip39-seed-phrase-compromise/) - [BIP 32 Explained: Hierarchical Deterministic Wallets](/bip-32/) [ Full BIP39 Wordlist ](/)