---
title: "BIP39 Word #686: fiber — Seed Phrase Mnemonic Word"
url: "https://bip39-phrase.com/bip39-word/fiber/"
language: "en"
updated: "2026-10-19T00:00:00+00:00"
---

Word #686 01010101101 

# fiber — BIP39 word #686

"**fiber**" is word #686 of the 2048 words in the official BIP39 English wordlist, between [few](/bip39-word/few/) and [fiction](/bip39-word/fiction/). In a seed phrase it stands for the 11-bit value `01010101101`, decimal index 685\. 

/faɪbə/  · _noun:_ a thin thread of material, or plant matter in food that aids digestion 

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

## Binary Representation

Six 1-bits and five 0-bits; 462 of the 2048 indexes have exactly six 1-bits.

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

[stick](/bip39-word/stick/)[between](/bip39-word/between/)[interest](/bip39-word/interest/)[east](/bip39-word/east/)[frozen](/bip39-word/frozen/)[faculty](/bip39-word/faculty/)[fish](/bip39-word/fish/)[feed](/bip39-word/feed/)[festival](/bip39-word/festival/)[field](/bip39-word/field/)[few](/bip39-word/few/) 

Position

Hex Index

0x2AD

4-Letter Prefix

fibe

## About "fiber" in BIP39

- "fiber" has 5 letters, but the first three, **"fib"**, already identify it, because **"fi"** also begins 19 other words, among them [fiction](/bip39-word/fiction/), [field](/bip39-word/field/), [figure](/bip39-word/figure/) and [file](/bip39-word/file/). Three letters are enough for only 604 of the 2048 words.
- "fiber" appears in one of the 24 official English [test vectors](https://github.com/trezor/python-mnemonic/blob/master/vectors.json) of BIP39: vector #13 (word 4 of 12). 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 #13

[ozone](/bip39-word/ozone/) [drill](/bip39-word/drill/) [grab](/bip39-word/grab/) fiber [curtain](/bip39-word/curtain/) [grace](/bip39-word/grace/) [pudding](/bip39-word/pudding/) [thank](/bip39-word/thank/) [cruise](/bip39-word/cruise/) [elder](/bip39-word/elder/) [eight](/bip39-word/eight/) [picnic](/bip39-word/picnic/) 

## Word #686 in the Other 9 BIP39 Wordlists

[Czech](/czech/) kroupa 

[French](/french/) entasser 

[Italian](/italian/) formica 

[Japanese](/japanese/) こりる 

[Korean](/korean/) 부산 

[Portuguese](/portuguese/) empolgar 

[Spanish](/spanish/) farmacia 

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

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

## Similar Words — Check Carefully During Recovery

Read aloud, "fiber" /faɪbə/ is one sound away from this word: 

[fire /ˈfaɪə/](/bip39-word/fire/) 

## More BIP39 Words Starting with "F"

[ #682 festival ](/bip39-word/festival/)[ #683 fetch ](/bip39-word/fetch/)[ #684 fever ](/bip39-word/fever/)[ #685 few ](/bip39-word/few/)[ #687 fiction ](/bip39-word/fiction/)[ #688 field ](/bip39-word/field/)[ #689 figure ](/bip39-word/figure/)[ #690 file ](/bip39-word/file/) 

[View all words starting with "F" ](/bip39-words/f/) 

## Seed phrase, key and recovery guides

- [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/)
- [How to Memorize a Seed Phrase: Color, Story and Palace Methods](/seed-phrase-memory/)

[ Full BIP39 Wordlist ](/)