---
title: "BIP39 Word #1029: letter — Seed Phrase Mnemonic Word"
url: "https://bip39-phrase.com/bip39-word/letter/"
language: "en"
updated: "2026-10-19T00:00:00+00:00"
---

Word #1029 10000000100 

# letter — BIP39 word #1029

"**letter**" is word #1029 of the 2048 words in the official BIP39 English wordlist, between [lesson](/bip39-word/lesson/) and [level](/bip39-word/level/). In a seed phrase it stands for the 11-bit value `10000000100`, decimal index 1028\. 

/ˈlɛtə/  · _noun:_ a written message sent by mail, or a symbol in an alphabet 

[Russian](/ru/ "The BIP39 wordlist with Russian translations"): письмо 

## Binary Representation

Two 1-bits and nine 0-bits; 55 of the 2048 indexes have exactly two 1-bits.

One wrong bit turns it into (leftmost bit first):

[above](/bip39-word/above/)[scene](/bip39-word/scene/)[party](/bip39-word/party/)[mountain](/bip39-word/mountain/)[mass](/bip39-word/mass/)[loyal](/bip39-word/loyal/)[little](/bip39-word/little/)[light](/bip39-word/light/)[length](/bip39-word/length/)[liar](/bip39-word/liar/)[level](/bip39-word/level/) 

Position

Hex Index

0x404

4-Letter Prefix

lett

## About "letter" in BIP39

- "letter" has 6 letters, but the first three, **"let"**, already identify it, because **"le"** also begins 17 other words, among them [leader](/bip39-word/leader/), [leaf](/bip39-word/leaf/), [learn](/bip39-word/learn/) and [leave](/bip39-word/leave/). Three letters are enough for only 604 of the 2048 words.
- **"lett"** is unique only within the English list: it also begins lettre in the [French list](/french/) and letterale in the [Italian list](/italian/), so a four-letter backup should say which list it uses.
- "letter" appears in three of the 24 official English [test vectors](https://github.com/trezor/python-mnemonic/blob/master/vectors.json) of BIP39: vectors #3 (words 1 and 9 of 12), #7 (words 1, 9 and 17 of 18) and #11 (words 1, 9 and 17 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 #3

letter [advice](/bip39-word/advice/) [cage](/bip39-word/cage/) [absurd](/bip39-word/absurd/) [amount](/bip39-word/amount/) [doctor](/bip39-word/doctor/) [acoustic](/bip39-word/acoustic/) [avoid](/bip39-word/avoid/) letter [advice](/bip39-word/advice/) [cage](/bip39-word/cage/) [above](/bip39-word/above/) 

## Word #1029 in the Other 9 BIP39 Wordlists

[Czech](/czech/) obvinit 

[French](/french/) indexer 

[Italian](/italian/) misurare 

[Japanese](/japanese/) そとづら 

[Korean](/korean/) 실현 

[Portuguese](/portuguese/) inalador 

[Spanish](/spanish/) lino 

[Traditional Chinese](/chinese-traditional/) 壤 

[Simplified Chinese](/chinese-simplified/) 壤 

## Similar Words — Check Carefully During Recovery

 One BIP39 word differs from "letter" by just a single letter — the most common source of typos when a seed phrase is entered by hand: 

[better](/bip39-word/better/) 

Read aloud, "letter" /ˈlɛtə/ is one sound away from these 2 words: 

[later /ˈleɪtə/](/bip39-word/later/)[leisure /ˈlɛʒə/](/bip39-word/leisure/) 

## More BIP39 Words Starting with "L"

[ #1025 length ](/bip39-word/length/)[ #1026 lens ](/bip39-word/lens/)[ #1027 leopard ](/bip39-word/leopard/)[ #1028 lesson ](/bip39-word/lesson/)[ #1030 level ](/bip39-word/level/)[ #1031 liar ](/bip39-word/liar/)[ #1032 liberty ](/bip39-word/liberty/)[ #1033 library ](/bip39-word/library/) 

[View all words starting with "L" ](/bip39-words/l/) 

## Seed phrase, key and recovery guides

- [Bitcoin Improvement Proposal (BIP): Process and Deployed BIP List](/bitcoin-improvement-proposal/)
- [TON Seed Phrase: 24-Word Format vs 12-Word BIP39 Phrases](/seed-phrase-format-for-ton-wallets/)
- [Recover Lost Bitcoin: Find Wallet Backups and Seed Phrases](/recover-lost-bitcoin-find-wallet-backups/)

[ Full BIP39 Wordlist ](/)