Nouns ending in -a (often Latin or scientific) add -e to form the plural.
Sigma is regular. It follows the -ae Addition rule.
Use plural verbs: "The sigmae are ready" (not "is ready").
Yes. The plural sigmae is standard across all English variants.
The word sigma follows the standard English pluralization rule. When forming the plural, sigma becomes sigmae. This follows the -ae Addition pattern, which is one of the most common plural rules in English.
Understanding why sigma becomes sigmae helps with spelling and pronunciation. Nouns ending in -a (often Latin or scientific) add -e to form the plural.
When using sigmae in writing, remember that it functions as a plural noun in sentences. It pairs with plural verbs and pronouns. For example: "The sigmae are ready" (not "is ready"). This subject-verb agreement is essential for grammatical correctness.