Etymology

y-system

Today it means: A convention whereby Esperanto’s circumflex accents (ĉ, ĝ, ĥ, ĵ, ŝ, ŭ) are replaced by an y after the non-diacriticked letter (cy, gy, hy, jy, sy, uy), for convenience of typing. Full definition →

Esperanto y-sistemo
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The story

  1. Esperanto · calque ofy-sistemo
  2. English todayy-system

Calque of Esperanto y-sistemo.

Etymology from Wiktionary, CC BY-SA 4.0.