Editing Sigma (section)

===Derived alphabets===
Sigma was adopted in the [[Old Italic alphabets]] beginning in the 8th century BC.
At that time a simplified three-stroke version, omitting the lowermost stroke, was already found in Western Greek alphabets,
and was incorporated into classical [[Etruscan alphabet|Etruscan]] and [[Old Italic scripts|Oscan]], as well as in the earliest [[History of the Latin script|Latin]] [[epigraphy]] (early Latin ''[[S]]''), such as the [[Duenos inscription]].
The alternation between three and four (and occasionally more than four) strokes was also adopted into the [[Elder Futhark|early runic alphabet]] (early form of the [[Sowilō|''s''-rune]]).
Both the [[Anglo-Saxon runes]] and the [[Younger Futhark]] consistently use the simplified three-stroke version.

The letter [[Es (Cyrillic)|С]] of [[Cyrillic script]] originates in the [[#Lunate sigma|lunate form]] of Sigma.