Quad: N. 1. Two Bits; Syn. For {quarter}, {crumb}, {tayste}.

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:quad: n. 1. Two bits; syn. for {quarter}, {crumb},
{tayste}. 2. A four-pack of anything (compare {hex}, sense 2).
3. The rectangle or box glyph used in the APL language for various
arcane purposes mostly related to I/O. Former Ivy-Leaguers and
Oxford types are said to associate it with nostalgic memories of
dear old University.
-- The AI Hackers Dictionary