double centre cutting edge or blade

sources:

Knife Edges 101 | KitchenKnifeGuru
https://kitchenknifeguru.com › knives › knife-edges-101
Feb 14, 2018 - Every knife has an edge style, a way the blade has been ground to make it sharp. The most common, of course, is a V-edge which looks like it sounds—two slanting sides that go straight to the cutting edge. The great majority of kitchen knives have this type of edge.

Types of Blade and Cutting Edges | Buying Guides and Tips ...
https://tottstore.com › types-of-blade-and-cutting-edges
Dec 3, 2013 - The sharp edge and tapering blade helps the knife to chop easily through food. This type of edge is often seen in European knives. Straight edges: This is most commonly found on preparation knives. A straight edge is ideal for chopping and slicing through food.

Knife - Wikipedia
https://en.wikipedia.org › wiki › Knife
A knife is a tool with a cutting edge or blade attached to a handle.

No question that skær is edge in this context; see the Danish definition here:
https://ordnet.dk/ddo/ordbog?select=skær,3&query=skær

I also found a picture of sideskær on a figure skate:
http://denstoredanske.dk/Livsstil,_sport_og_fritid/Sport/Ish...

As for your 'dobbelt centerskær,' all you have to do is change your word order slightly - it's obviously a double-edge(d) knife or blade:
https://www.knivesplus.com/double-edge-knives.html

But now we come to the question of centerskær and sideskær. If you were in a big hurry you might transliterate to "center edge" and "side edge," but these don't really roll off the tongue. I didn't do an in-depth search, but at least for kitchen knives, it would appear that "V-edge" and "chisel edge" will serve:
https://kitchenknifeguru.com/knives/knife-edges-101/