A3
"a3" is a 1-letter English headword indexed on PlainSpell.
The verdict
“A3” sits in 20 confusable pairs (corpus #19,748) as a noun. The look-alike neighbours are the real trap.
- #19,748
- frequency rank, English
- 3,931
- “A” headwords
- 20
- confusable pairs
According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - A one-page document, often tabular or graphical, on such paper.
Corpus desk
Index EN-a3 · A3 · English
A3 · rank #19,748 · 0 variants · 20 confusables
- FREQ-MID #19,748
- LEN-SHORT 2 letters
- VOW-1 1 vowel
- CONFUS-HIGH 20 pairs
- VAR-0 0 variants
- BOOK-MID 3,931
- PHOTO-FINISH zipper
Nearest frequency peer: zipper (-1 rank slots)
Read with this headword: Spelling guide for this pattern
Desk codes from Wiktionary headword shape, FrequencyWords rank tier, confusable-pair count, generated misspelling depth, letter-cohort book size, and photo-finish peer. Not a difficulty grade.
Frequency neighbours of confusable “A3”
Peers at similar corpus weight, separate from look-alike pairs below
- Yamaha
Yamaha
80,256 corpus weight
- Zara
Zara
80,255 corpus weight
- zipper
zipper
80,254 corpus weight
- A3
A3
80,253 corpus weight
- acclaim
acclaim
80,252 corpus weight
- aching
aching
80,251 corpus weight
What this shows Bars place “A3” against nearest ranked English headwords, not a reprint of the confusable-pair desk.
Visual similarity to commonly confused words
How many letter changes separate each confused pair (Levenshtein distance, normalized).
Source: PlainSpell confusable corpus (Wiktionary, CC BY-SA).
| Property | Value |
|---|---|
| Headword | A3 |
| Language | English |
| Part of speech | Noun |
| Letters | 2 |
| Frequency rank | #19,748 |
| Misspellings tracked | 0 |
| Confusable pairs | 20 |
| Source | Wiktionary (kaikki.org) |
Corpus rank beside confusables of “A3”
Easy to mix with look-alikes
The spelling risk for A3 is neighbouring look-alikes ("as", "at", …), not just typos; it is anoun. Frequency #19,748 among 3,931 “A” headwords. 2 recorded senses keep meaning in play.
A3 doesn't appear in our generated misspelling index, a sign its spelling follows regular English conventions. It also participates in 20 confusable-pair relationships, "as", "at", "an", and more, a pairing that trips writers up because the two words share enough sound or shape to blur together.
Etymologically, the entry records: See the Wikipedia article ISO 216, the international standard on paper sizes. The correct English form is A3, spelled A-3.
Definition
- 1A one-page document, often tabular or graphical, on such paper.
- 2A3 class, a class of steam locomotive used on the London and North Eastern Railway.
Etymology
See the Wikipedia article ISO 216, the international standard on paper sizes.
Definitions, pronunciation, and etymology for this entry are drawn from Wiktionary via the kaikki.org structured extract (CC BY-SA); frequency ordering uses the FrequencyWords open word-frequency list (2018 English corpus, MIT). See the methodology for how each field is sourced and updated.