book — BIP39 word #205
"book" is word #205 of the 2048 words in the official BIP39 English wordlist, between bonus and boost.
In a seed phrase it stands for the 11-bit value
00011001100,
decimal index 204.
/bʊk/ · noun: a set of printed pages bound together inside a cover
Russian: книга
Binary Representation
Four 1-bits and seven 0-bits; 330 of the 2048 indexes have exactly four 1-bits.
One wrong bit turns it into (leftmost bit first):
Position
#205 of 2048
Hex Index
0x0CC
4-Letter Prefix
book
About "book" in BIP39
- It takes all four letters to identify "book": "boo" also begins boost.
- "book" appears in one of the 24 official English test vectors of BIP39: vector #15 (word 12 of 24). Every official vector passes the checksum checker, and How BIP39 works shows how the entropy turns into such words.
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Word #205 in the Other 9 BIP39 Wordlists
Similar Words — Check Carefully During Recovery
One BIP39 word differs from "book" by just a single letter — the most common source of typos when a seed phrase is entered by hand:
Read aloud, "book" /bʊk/ is one sound away from this word:
Words sharing the first three letters "boo":