Happily I've seen both QuickTime and "Qt" abbreviated as "qt", "Qt", and "QT" because human languages are often ambiguous (in fact all written human languages c

Happily I've seen both QuickTime and "Qt" abbreviated as "qt", "Qt", and "QT" because human languages are often ambiguous (in fact all written human languages can have ambiguity, but not all have capitalization, so arguably the former ambiguity is more prevalent and important than the latter)