From Longman Dictionary of Contemporary Englishdecimal pointˌdecimal ˈpoint noun [countable] HMNthe full stop in a decimal, used to separate whole numbers from tenths, hundredths etcExamples from the Corpus

decimal point• WordPerfect will stop alignment at a period, just as if you entered a decimal point.• Forbes can apparently spout the results of all presidential elections to the nearest decimal point.• The longest number in the second column will be six characters to the left of the decimal point.• The cursor is on the decimal point. 5. type 1,056,090.• The decimal point is introduced after every three digits; for example, 631.589.2 Hydroponics.