To make numbers easier to read (so you quickly know how many digits there are), it is customary to separate each group of three digits by some separator. The separator can be a period, a comma, a space, an apostrophe... the rules vary from country to country.
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Nothing at all. They are just three single-digit numbers in a line with a space between each digit.
Three numbers in a line, with a space between each pair.Three numbers in a line, with a space between each pair.Three numbers in a line, with a space between each pair.Three numbers in a line, with a space between each pair.
The space between consecutive prime numbers.
There are up to 3 numbers and up to 5 letters in a UK postcode. One or two letters, followed by one or two digits OR one digit and a letter, followed by a space, followed by one digit, followed by two letters.
It is the space between two real numbers.