Word #4 00000000011

about — BIP39 word #4

"about" is word #4 of the 2048 words in the official BIP39 English wordlist, between able and above. In a seed phrase it stands for the 11-bit value 00000000011, decimal index 3.

/əˈbaʊt/ · preposition: on the subject of or concerning something

Russian: о, около

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):

lesson document call away anchor afford act accident abstract ability able

Position

#4 of 2048

Hex Index

0x003

4-Letter Prefix

abou

About "about" in BIP39

"about" has 5 letters, but the first four, "abou", already identify it, because "abo" also begins above.
"abou" is unique only within the English list: it also begins aboutir in the French list, so a four-letter backup should say which list it uses.
"about" appears in one of the 24 official English test vectors of BIP39: vector #1 (word 12 of 12). Every official vector passes the checksum checker, and How BIP39 works shows how the entropy turns into such words. As the last word of vector #1, its final 4 bits, 0011, are the checksum of the 12-word phrase.