| Singular | Plural | |
|---|---|---|
| Nominativ | sigma, antisigma, sigma | sigmata, sigmata |
| Genitiv | sigmatis, sigmatis | sigmatium, sigmatium, sigmatum, sigmatum |
| Dativ | sigmati, sigmati, sigmate | sigmatibus, sigmatibus |
| Akkusativ | sigma, antisigma, sigma | sigmata, sigmata |
| Ablativ | sigmate, sigmate | sigmatibus, sigmatibus |
| Vokativ | sigma, antisigma, sigma | sigmata, sigmata |