Meaning of Symbol on Miller Bobcat 250 Fuel Gauge

[amdx]

Hi Guys,
I have a Bobcat 250, that I bought for use as a generator.
I had to use it for a few hrs last night, I noticed a blinking symbol
on the fuel gauge that I can't find in the manual.
You can see the fuel gauge in the link below, the third picture.
On the lower left side you see a rectangle with two triangles point to
point.
What does it represent?

http://www.millerwelds.com/resources/articles/long-welder-engine-life-Miller-Kohler

I paid $3,375 less than 4 years ago, it now goes for $4,800.
42% increase, but the government says inflation is low.

Thanks, Mikek

[Pete C.]

That's the blinking hourglass symbol indicating the meter is
accumulating engine run time hours.

[amdx]

They must have thought I was smart enough to figure that out,
so they didn't put it in the manual. :-)
Thanks, Mikek