Bitcoin market hours (open/close prices) If Bitcoin trading never stops then what does it mean when news sites and others talk about bitcoin opening or closing at a certain price, and why is this terminology used?

Could two people mean different things when they talk about the closing price at the same date? (apart from price differences between exchanges)
In 24 hour markets High and Low usually mean "highest/lowest price in last 24 hours". 

Open generally refers to the price at 12:01 AM UTC of any given day and close generally refers to the price at 11:59 PM UTC of any given day.