Page "Koppa (letter)" Paragraph 13

Conversely, older fonts may have the normal numeral glyph at the uppercase codepoint U + 03DE, while this position may be filled with any of several less common glyphs in newer ones.

Since there had never been a consistent typographic tradition for a specifically uppercase numeral koppa, the typographer Y, Haralambous proposed two new variants for it, x16px and x16px, noting that he himself found them not " entirely satisfactory ".