The decimal separator is used to mark the boundary between the integer and the fractional parts of a decimal numeral.
Originally (near the end of the first millennium CE), a bar over the units digit was used. Later, a separator (a short, roughly vertical, ink-stroke) between the units and tenths position became the norm. When type-set, it was convenient to use the existing comma, stop, or point marks for this purpose.
In many countries, therefore, the comma is used to mark the decimal units position; however, in predominantly English-speaking countries, a stop (.) or point (middle dot: ·) is commonly used as the decimal point symbol.
In Germany, Romania and much of Europe: 1 234 567,89 or 1.234.567,89 (in handwriting you may also come across 1·234·567,89)
In Switzerland(mainly German-speaking Switzerland): 1'234'567,89
In the UK and USA: 1,234,567.89 or 1,234,567·89; the latter is more commonly found in older, and especially handwritten, documents nowadays; many UK schools now teach the SI style.
SI style: 1 234 567.89 (dot countries) or 1 234 567,89 (comma countries)
Dot countries
Countries where a dot is used to mark the radix point include:
A repeating decimal, also called a recurring decimal, is a number whose decimal representation eventually becomes periodic (i.e., the same sequence of digits repeats indefinitely).
In the United States, the decimal point is denoted with a period (e.g., 3.1415), whereas a raised period is used in Britain (e.g., 3.1415), and a decimalcomma is used in continental Euro
In this system, each "decimal place" consists of a digit 0-9 arranged such that each digit is multiplied by a power of 10, decreasing from left to right, and with a decimal place indicating the 10^0==1s place.
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