--- title: "BIP39 Word #1093: mass — Seed Phrase Mnemonic Word" url: "https://bip39-phrase.com/bip39-word/mass/" language: "en" updated: "2026-10-19T00:00:00+00:00" --- Word #1093 10001000100 # mass — BIP39 word #1093 "**mass**" is word #1093 of the 2048 words in the official BIP39 English wordlist, between [mask](/bip39-word/mask/) and [master](/bip39-word/master/). In a seed phrase it stands for the 11-bit value `10001000100`, decimal index 1092\. /mæs/ · _noun:_ a large amount of matter without a definite shape, or a crowd [Russian](/ru/ "The BIP39 wordlist with Russian translations"): масса ## Binary Representation Three 1-bits and eight 0-bits; 165 of the 2048 indexes have exactly three 1-bits. One wrong bit turns it into (leftmost bit first): [ancient](/bip39-word/ancient/)[silk](/bip39-word/silk/)[possible](/bip39-word/possible/)[obtain](/bip39-word/obtain/)[letter](/bip39-word/letter/)[milk](/bip39-word/milk/)[melody](/bip39-word/melody/)[maze](/bip39-word/maze/)[marine](/bip39-word/marine/)[match](/bip39-word/match/)[master](/bip39-word/master/) Position Hex Index 0x444 4-Letter Prefix mass ## About "mass" in BIP39 - It takes all four letters to identify "mass": **"mas"** also begins [mask](/bip39-word/mask/) and [master](/bip39-word/master/). - **"mass"** is unique only within the English list: it also begins massif in the [French list](/french/), massaia in the [Italian list](/italian/) and massagem in the [Portuguese list](/portuguese/), so a four-letter backup should say which list it uses. - "mass" appears in one of the 24 official English [test vectors](https://github.com/trezor/python-mnemonic/blob/master/vectors.json) of BIP39: vector #21 (word 18 of 24). 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. Official test vector #21 [all](/bip39-word/all/) [hour](/bip39-word/hour/) [make](/bip39-word/make/) [first](/bip39-word/first/) [leader](/bip39-word/leader/) [extend](/bip39-word/extend/) [hole](/bip39-word/hole/) [alien](/bip39-word/alien/) [behind](/bip39-word/behind/) [guard](/bip39-word/guard/) [gospel](/bip39-word/gospel/) [lava](/bip39-word/lava/) [path](/bip39-word/path/) [output](/bip39-word/output/) [census](/bip39-word/census/) [museum](/bip39-word/museum/) [junior](/bip39-word/junior/) mass [reopen](/bip39-word/reopen/) [famous](/bip39-word/famous/) [sing](/bip39-word/sing/) [advance](/bip39-word/advance/) [salt](/bip39-word/salt/) [reform](/bip39-word/reform/) ## Word #1093 in the Other 9 BIP39 Wordlists [Czech](/czech/) okupant [French](/french/) jugement [Italian](/italian/) nemmeno [Japanese](/japanese/) たおる [Korean](/korean/) 양주 [Portuguese](/portuguese/) jejum [Spanish](/spanish/) mañana [Traditional Chinese](/chinese-traditional/) 丁 [Simplified Chinese](/chinese-simplified/) 丁 ## Similar Words — Check Carefully During Recovery 3 BIP39 words differ from "mass" by just a single letter — the most common source of typos when a seed phrase is entered by hand: [mask](/bip39-word/mask/)[miss](/bip39-word/miss/)[pass](/bip39-word/pass/) Read aloud, "mass" /mæs/ is one sound away from these 6 words: [gas /gæs/](/bip39-word/gas/)[mad /mæd/](/bip39-word/mad/)[man /mæn/](/bip39-word/man/)[match /mæʧ/](/bip39-word/match/)[math /mæθ/](/bip39-word/math/)[mouse /maʊs/](/bip39-word/mouse/) Words sharing the first three letters "mas": [mask](/bip39-word/mask/)[master](/bip39-word/master/) ## More BIP39 Words Starting with "M" [ #1089 marine ](/bip39-word/marine/)[ #1090 market ](/bip39-word/market/)[ #1091 marriage ](/bip39-word/marriage/)[ #1092 mask ](/bip39-word/mask/)[ #1094 master ](/bip39-word/master/)[ #1095 match ](/bip39-word/match/)[ #1096 material ](/bip39-word/material/)[ #1097 math ](/bip39-word/math/) [View all words starting with "M" ](/bip39-words/m/) ## Seed phrase, key and recovery guides - [Private Key QR Code Risks: Why Online Generators Are Unsafe](/qr-code-private-key-security-risks/) - [Seed Phrase Formats by Network: BIP39 and the Exceptions](/seed-phrase-formats-by-network/) - [BIP39 vs BIP32 vs BIP44: How the Seed Standards Fit Together](/crypto-seed-standards-bip39-vs-bip32-vs-bip44/) [ Full BIP39 Wordlist ](/)