KB mean kbps or KBps (speed) or KB (data usage)

On the Graph Windows it show KB does this mean kbps or KBps or KB data usage?

The top left speed value shows the average speed on the whole interval, which may be 5 min, 3 hours, 24 hours etc.

The lower-left values (for example 9 KB and 1 KB) show the number of downloaded/uploaded bytes on the sub-interval, which may include more than 1 second.