Because they are not explained as they should, a lot of people have troubles using and understanding numerals. One of the most frequent mistake is, TV anchors using the value of billion instead of million and vice versa. People with little or no education use the letter "O" to name the numeric symbol of "0" (zero). They are 2 different symbols! Excepting a vague similarity in form, a letter is a letter while a number (numeral) is a number.

The level of development a Civilization has is perfectly reflected by its knowledge in using numerals. Even more, the numeral was one of the most important factors which have determined the apparition of any language, anywhere. Not only the numeral is a perfectly defined morphologic category, but using it appropriately is of capital importance in any language, in any Civilization, forever!