A Latin abbreviation and musical notation used in Gregorian chant, representing the vowels of 'seculorum amen' (Latin for 'of the ages, amen').
Acronym from Latin vowels: E-U-O-U-A-E from the ending of the Gloria Patri ('Glory be to the Father'). Used as a shorthand in medieval musical notation.
Euouae is one of the weirdest abbreviations in human history—medieval monks basically invented texting by reducing words to just vowels, and you see it preserved in countless Gregorian chant manuscripts.
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