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Was ∆ used in APL as a substitute for space because ECMA-17/ISO 2047 specified △ as graphical representation for space?
Wikipedia on naming conventions in programming states (without source):
In APL dialects, the delta (Δ) is used between words, e.g. PERFΔSQUARE (…)
This is an unusual choice, but I notice that ECMA-...
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