Searched for both on the net, no such thing apparently. I was just taking a look at the sprocket to verify TDC for the crank and noticed the oil pump wasn't stock. At least...in my newbie-impaired eyes it ain't.
Also, wtf is with the white dot? There is another one on the other side of the sprocket washer, and since cylinders 2 and 3 are near TDC right now I assume the alignment is TDC for cylinders 1 and 4. I thought the arrow was the TDC marker. If the oil pump isn't stock then perhaps the arrow isn't right for a D16Y7?