If it's not a brand name then it's called " A fish tank".

No clarification necessary. There are a lot of tanks out there that were custom made so this may just be one of those. I have 2 sets of tanks that are the same dimensions length and width but the heights are different. Turns out, neither is a standard tank but I got 19 of 1 and approx. 125 of the other. Thankfully, I am custom making all the stands so it doesn't matter what they are called. The only thing that matters is the gallonage and I measured those so I know pretty much where 1
gal, 5
gal, 10
gal etc is. This is necessary if I need to medicate in them. You should probably do the same with yours. If you need to buy equipment for it, as Gillie wrote, that tank dimensions should hold just under 21 gals of water so you want to make sure any filters or accessories can handle that much water at least. The hood or stand will most likely need to be custom made. It's not wide enough for 20 long/29
gal ( 30"L x 12" W) equipment and it's too long for standard 10
gal ( 20"L x 10" W) accessories. This is why I'm thinking custom.