I always referred to 1440p as 2k... woops
1440P is WQHD Wide Quad High Definition
1440P is to 720P what 2160P is to 1080P & what 1800P is to 900P.
So when the new consoles come out & we are unsure of what to be happy or mad about the easy thing to do is look at 1440p as 720p , 1800p as 900p & 2160p as 1080p so we can resolution whine like old times.