Quiz Question needed.

[Last Hussar]

For... reasons... I am doing a pub quiz round 'all about me'. 

So far I have

Me! – I don't know if you realise, I was born 23rd February. What Star Sign am I? We're talking traditional western star signs, as found in newspaper horoscopes.

(I have told them this date already, repeatedly; another round is 23 Feb)

Me! – I am five foot nine. What is that in metric? What is five nine in metres or centimetres?

Me! – Multiple choice. Yesterday was my 57th birthday; as of today, how many days old am I? Ten thousand, eight hundred and nineteen days, twenty thousand eight hundred and nineteen days or thirty thousand eight hundred and nineteen days? Just put 10, 20 or 30. Roughly how many days in 57 years – 10, 20 or 30 thousand?

(this is going to be asked on the day after my birthday, obviously)

Me! – I can often be found at 83, HP19 9AJ. What is it?

(It's the postcode of the pub I will be standing in, that has posters on the wall WITH THIS ON IT!)

As you can see, they are all general knowledge questions, not actually specific to me.

I need one more question for this set; any ideas?

[Ithoriel]

How about -

One of my hobbies involves things variously known as bones, knucklebones, ivories or D6. What is the dictionary word for these?

[Last Hussar]

I already have a question 'What is a D20', though I think I'll replace it with this.

[Duke Speedy of Leighton]

Instead of the pub postcode, maybe use what-3-words, it has better accuracy down to 3m squares. 

How about something about where you were born? Which county? What Chinese calender symbol? Birth stone?

[Last Hussar]

Nobody advertises with What3Words. I'm using the postcode precisely because it's on the posters in the pub!

[Last Hussar]

Which violet semiprecious gemstone is the birthstone for February? It's name comes from the ancient Greek belief that it would protect you from drunkeness. The highest-grade, called deep Russian, is exceptionally rare.