Qoppa is an obsolete letter of the Greek alphabet and has a numeric value of 90. Greek never used the sound it represented, a uvular plosive. 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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