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