sig vs sigma, What's the Difference?

Which to use

“sig” is a contraction and “sigma” is a noun - they look or sound alike but fill different roles in a sentence.

#22,189
“sig” frequency rank: #36,291
“sigma” frequency rank: 58480
confusion score

Side-by-Side Comparison

Feature	sig	sigma
Definition	Contracción de signature (firma).	Parte del intestino grueso que, en el hombre, continúa después del colon descendente, a la altura de la pelvis y es seguido por el recto. En esta parte los gases se acumulan para ser luego expulsados sin interferir con las heces.

Where the spellings diverge

Shared letters are muted; the letters that actually set sig and sigma apart are highlighted. They share 3 letters in sequence, which is exactly why the eye skips the difference.

3 ch

sig

5 ch

sigma

Spelling & Dictionary Insight

These two trip readers on the page rather than in the ear: sig is /sɪɡ/ while sigma is [ˈsiɣ̞ma]. Spoken aloud the problem disappears. In writing it persists, because they differ by 2 extra letter(s) - “sig” sits inside “sigma”, and the parts of speech differ too (contraction vs noun), which is usually the fastest check. Our composite confusion score for this pair is 58480, derived from the frequency rank of both members and their visual similarity.

sig is recorded at frequency rank #22,189, classified as acontraction, pronounced /sɪɡ/. sigma is at rank #36,291, tagged as anoun, pronounced [ˈsiɣ̞ma].

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 58480, this pair ranks #66,307 of 323,831 scored Spanish confusable pairs - among the most confusable pairs.

Orthographic DNA of sig vs sigma

Shared letters: gis. Private to "sig": -. Private to "sigma": am.

"sig" · 3 letters · shape CVC · "sigma" · 5 letters · shape CVCCV

Known mistypes of this pair

sigma ← cigma · isgma · sgima · sigam · siggma · sigmma · simga · ssigma

Frequency comparison

sig#22,189

sigma#36,291

Source: FrequencyWords open word-frequency list

Frequently Asked Questions

Can "sig" and "sigma" be used interchangeably?

No - they are not even the same part of speech. "sig" is a contraction and "sigma" a noun, so a sentence built for one is usually ungrammatical with the other.

Which is more common, "sig" or "sigma"?

"sig" is the more common of the two: it sits at frequency rank #22,189 in our Spanish list, against #36,291 for "sigma". The two are close in frequency, so neither is a safe default; check the meaning rather than guessing.

Remembering sig vs sigma

The fastest way to pick the right one every time.

Check the role first: if you need a contraction, it's “sig”; for a noun, it's “sigma”.
See each word in full, definition, IPA, etymology and its other confusables. Full “sig” entry
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