Typically, yeah. A letter is generally used as a variable, but the conversation up to that point had been:
dcfash: ?
Vasu: ??
Tamashiiryuu: ?x3=???
Hraesvelg: Algebra fail. 3 x ? = 3?
Vasu: Yeah so: ? x ? x ? = ??? or ?^3
That's why I used ? as the variable, just to get to the punchline of ?!.
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