Letter
Letter noun - A message on paper from one person or group to another.
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Synonyms for Letter
Sigma and letter are semantically related. In some cases you can replace term "Sigma" with "Letter", this nouns are similar.
Sigma
Mutual synonyms
Both words in one sentence
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Meaningful Name: In mathematics, the Greek letter sigma is used to denote "summation", hinting at Sigma's ability to accumulate memories from alternate timelines.
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In the 15th century, syphilis was such a terrifying disease that physicians would represent it with the Greek letter Σ (Sigma).
Source: The Scottish Trope -
One of Enigma's latest CDs replaced the initial E with a Greek letter sigma. Sigma-nigma?
Source: Xtreme Kool Letterz
Cite this Source
Sigma and Letter. (2016). Retrieved 2026, July 30, from https://thesaurus.plus/related/letter/sigma
Letter & Sigma. N.p., 2016. Web. 30 Jul. 2026. <https://thesaurus.plus/related/letter/sigma>.
Sigma or Letter. 2016. Accessed July 30, 2026. https://thesaurus.plus/related/letter/sigma.
Google Ngram Viewer shows how "letter" and "sigma" have occurred on timeline