Which to use
“sigma” and “signal” are a confusable English pair: similar on the page, but distinct in meaning, check the gloss before you choose.
- #14,835
- “sigma” frequency rank
- #2,406
- “signal” frequency rank
- 17241
- confusion score
Side-by-Side Comparison
| Feature | sigma | signal |
|---|---|---|
| Definition | The eighteenth letter of the Classical and Modern Greek alphabets (Σ, σ), the twentieth letter of Old and Ancient. | A sequence of states representing an encoded message in a communication channel. |
Where the eye mixes sigma and signal
Muted = shared; highlighted = the visual trap. They share 4 letters in sequence.
Look-alike desk: sigma vs signal
A purely visual mix-up. sigma (/ˈsɪɡmə/) and signal (/ˈsɪɡnəl/) are said differently, so reading them aloud is the quickest way to catch the wrong one. On the page they stay close: they differ by 1 letter(s) in length. Our composite confusion score for this pair is 17241, derived from the frequency rank of both members and their visual similarity.
sigma is recorded at frequency rank #14,835, classified as anoun, pronounced /ˈsɪɡmə/. signal is at rank #2,406, tagged as anoun, pronounced /ˈsɪɡnəl/.
Glosses for this pair are partially populated in our dataset, but the full side-by-side definitions above should still guide you to the right choice.
With a confusion score of 17241, this pair ranks #452,708 of 530,003 scored English confusable pairs - a relatively easy-to-tell-apart pair.
Orthographic DNA of sigma vs signal
Shared letters: agis. Private to "sigma": m. Private to "signal": ln.
"sigma" · 5 letters · shape CVCCV · "signal" · 6 letters · shape CVCCVC
Known mistypes of this pair
Frequently Asked Questions
Can "sigma" and "signal" be used interchangeably?
Frequency check: "sigma" vs "signal" - which ranks higher?
What to do next
Eye-level mix-up between "sigma" and "signal" is sorted above. Next: full entries or other pairs that share a letter shape.
- Full dictionary entry for "sigma" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "signal" - compare definitions side by side with the headword page. Word entry
- This pair ranks #452,708 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "sigma" and "signal" also get mixed up with nearby pairs, the highest-scored neighbour is "sigma vs Sitka". Nearby pair
- Recorded mistypes exist for at least one side of this pair, useful when a spell-checker or OCR lands on the wrong form. See mistypes
Confusion rank #452,708 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.