A Link to the Past had a "flute" that called a bird as a fast travel mechanic. The icon looked like a blue transverse ocarina but the in-game text called it a "flute."

For some reason they based the next major console game in the series entirely around this instrument, correctly identified it as an ocarina this time, and ocarinas have officially been blue ever since. Having lived through the N64 era it's hilarious watching people re-discover them.