the office - What does the "keleven" digit look like?

So the keleven, as you say, was used by Kevin to balance the books:

Oscar: [on the phone] Years ago, the senator promised a left turn lane
by the Arby’s. So I wanna know where in the name of horsey sauce is
it? Well, yeah, you…hold on.

Dakota: Hi. I keep seeing this symbol in
the accounts from last year. It’s..it’s all over the place. I don’t
know what it means.

Oscar: That’s the reason Kevin got fired. It’s
his magic number. He used to use it to balance his accounts. He used
to call it a Keleven. He told Dwight, [imitating Kevin] “A mistake
plus Keleven gets you home by seven.” He was home by 4:45 that day.

Aside from these words and despite extensive googling, there is absolutely no reference anywhere to what the symbol might actually look like. I even went through a combination of different searches on google images and instagram, but came up empty handed.

Therefore, I'm going to say no, we have no way of knowing what the symbol looks like as the producers of the show have never attempted to release it (and have likely never even created it).