# What is a digit?

The question that arises is not for everyone and not always -What is a figure? Most often, parents first respond to him, and then teachers in school or kindergarten. The word "figure" appeared from the Latin "cifra" and from the Arabic "sifr", which means - empty or zero.

## What is a number and a digit

In the dictionary of Dahl it is said that the figure is a numerical sign. In other words, the numbers are signs of numbers, just like letters are signs of sounds.

How many figures do we know? Correctly, only 10 and we know them such - 1, 2, 3, 4, 5, 6, 7, 8, 9, 0. And numbers - infinity, because from the combination of numbers "multi-valued numbers" are obtained, for example 12, 958 , 1054630 and so on.

Natural numbers are used for enumeration (first, second, and so on) and to denote the number of objects (one object, two subjects, ...).

### What other figures are there?

- Arabic numerals. These signs we use, how much we remember ourselves (and not only ourselves). They became known to Europeans in the 10th century. Pope Sylvester II was one of the first to get acquainted with these "simple" figures and began to promote their implementation, because he understood the convenience of their use.
- Roman numerals. They appeared in the Etruscans (tribes that lived in the north-west of the Apennine peninsula, now Tuscany, even a thousand years before our era) and for 5 centuries before our era. They are written as I, II, III, IV, V, VI, VII, VIII, IX, X. It is interesting that the known number of "IV" began to be written just like this in the XIX (19) century, previously wrote "IIII".
- Figures of the Maya. Their record was based on a 20-positioning system, and it was used for calendar calculations. In everyday life, a system similar to the ancient Egyptian (hieroglyphic symbols) was used.

Now for a modern person, the figure is notonly a mathematical sign. Digital television has appeared (we know that this is the best image and sound than the analogue one). The digital format is the type of signal in the electronics. For example, in cameras, it is used to store data in digital (binary) format, so there are colors described by bits (unit of information amount).