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υUpsilon · 90 points · 1 characters
Upsilon is Greek letter 20.
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Upsilon90 points · Shortest accepted spelling: υ
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- Apply the complete question boundary: English letter names or Greek characters count. Archaic letters such as digamma are outside the 24-letter set.
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Each entry belongs to the bounded set defined by the prompt. The named source supports the underlying facts; our editorial scoring is a separate layer.
Source: Open University · The Greek alphabet ↗
Reference version: 2026-10-21. See our answer policy for how we handle aliases and omissions.