Multiple selectors (e.g. scores or distance) allow for you to specify a range of values to test for, instead of just a single value. They are denoted by two dots which seperate the min and max value (including): min..max
Either one can be left out to signify an open-ended range. Leaving writing a single number signifies an exact check for this value alone.
1 means “exactly 1”
1.. means “1 or more”
..1 means “1 or less”
1..9 means “1 to 9”
Some selectors (like distance) also allow for decimal numbers. 0.5..0.9 works fine in those instances.
[!IMPORTANT] Ranges are not useable when checking for NBT!