trip computer question

[buzz19]

I had my renault 19 16v 1993 K hatch for over a year now I worked all the functions on the trip computer except one

1. I got mileometer that I reset when I fuel up
2. I got mpg which goes up and down as it should
3. I got miles remaining
4. I get what I belive to be a count down timer probably in hours displayed like for e.g. 2.3

but the fith one I not got a clue it displays a three figure number in my case 122 which for the first time changed to 126 then changed back, with a small circle or square next to the two. which looks like a degree sign

any ideas guys let me know