There's no good (or bad) choices for mapping abstract concepts like ranges, mapping, reducing, or combining to common (ASCII-) symbols. Every choice is inherently arbitrary and carries no meaning whatsoever (besides maybe ergonomics). One could just as well argue that "/" is the ISO 8000-2:2009 2-9.6 recommended symbol for division. The same source also shows why symbols alone are inadequate for an explicit representation of abstract concepts: the Nabla symbol alone represents 5 different operations depending on context according to the ISO standard.

What would be a more obvious symbol choice for range (aka til or seq)? Pound (#)?