When I learnt to say the numbers in English I was surprised that zero can be letter O. The same symbols mean different things in different countries sometimes.
I can imagine if I say I need to go the nil/zero room some might not understand. In Mongolia and Russia toilet signs were 00 in 19th century. Since then in Mongolia the phrase ‘going to the nil’ means ‘spending a penny’ in UK. In other words it means going to toilet. Another idiomatic traditional Mongolian phrase is ‘to see a horse.’ Basically the nomadic lifestyle meant horses were and still are used as transport. So horses need to be checked regularly to see if they are nearby.