Qoppa

Qoppa is an obsolete letter of the Greek alphabet and has a numeric value of 90. It has been attested in Linear B glyphs and in early Aeolic and Boeotian scripts. Greek dropped the sound it represented, a labio-velar plosive, in the post-Mycenaean era, and the letter survived for a few more centuries in certain dialects before becoming altogether extinct by pre-Classical times. There are two very different glyphs for qoppa: "archaic Qoppa" (Ϙ ϙ) used to write words and "Numeric Qoppa" (Ϟ ϟ) used in modern Greek legal documentation.

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Greek alphabet: The Greek language is written in the Greek alphabet, developed in classical times (ca 9th century B.C.) and passed down to the present. It is the world's oldest alphabet in use today. In ancient Greece its letters were also used to represent numbers, called Greek numerals, analogous to Roman numeral...

Numeric: Numeric may refer to:...

Linear B: Linear B is the script that was used for writing Mycenaean, an early form of the Greek language....