# Double dot on spotlight calculator

So I'm playing around with the Spotlight calculator, and came across a weird thing:

If I type

`1..1`, I receive `0.1`
`5..6`, I receive `3`
`523..6.1`, I receive `31.38`

Does anybody know what mathematical function this is?

Edit: This works on macOS Sierra 10.12.2, as for people in the comments, it looks like three dots are required on macOS High Sierra.

• I don't get those results when I use Spotlight on my MBP on High Sierra. I get a bunch of different answers but none of them is mathematical.
– fsb
Oct 18, 2017 at 22:32
• This doesn't work for me with two dots, only with three
– grg
Oct 18, 2017 at 22:32
• Yep, 3 dots is what it takes.
– fsb
Oct 18, 2017 at 22:35
• @fsb Huh... Works perfectly fine for me with two. I'm on Mac OS Sierra 10.12.2.
– user260245
Oct 19, 2017 at 2:37

`5..6=3` turns into `5 * .6 = 3`
As we know that `.` is another way of saying 'multiply' its simply, 5 multiplied by .6
As for `523..6.1=31.38`, it turns into `523 * (.6 * .1) = 31.38`