Sometimes when you want to emphasise a particular WORD, you CAN (but probably shouldn't) use upper case letters.

Why then, are there no upper case numbers?

Capital letters add a lot to text in various ways, for names, brands, emphasis (although capitalisation for emphasis is frowned upon)

Why then, are there no upper case numbers?

Sometimes when you want to emphasise a particular WORD, you can use upper case letters.

Why then, are there no upper case numbers?

Sometimes when you want to emphasise a particular WORD, you CAN (but probably shouldn't) use upper case letters.

Why then, are there no upper case numbers?

Sometimes when you want to emphasise a particular WORD, you can use upper case letters (but technically shouldn't)

Why then, are there no upper case numbers?

Sometimes when you want to emphasise a particular WORD, you can use upper case letters.

Why then, are there no upper case numbers?