I have heard this pattern being called both names.

RS-*k,p* repeat
WS-*k,p* repeat

Which charts out as:

kpkpkpkpkpkpk
pkpkpkpkpkpkp
kpkpkpkpkpkpk

Where k=knit stitches, p=purl stitches view from the right side

Is this a US vs UK thing? Or am I wrong on the names?

Yep, it's a difference in UK/US terms. Here's the explanation from a post on Ravelry:


UK seed stitch is a stockinette background with an occasional purl stitch
US seed stitch is alternating knits and purls across the row and up the columns [that's like your example above]

UK moss stitch is the same as US seed stitch
US moss stitch is alternating knits and purls across the row for two rows, and then alternating purls and knits for two rows.

UK double moss stitch is the same as US moss stitch
US double moss stitch is two knits alternating with two purls across the row and up the columns

UK box stitch is the same as US double moss stitch

Okay, that is what I thought. But I wasn't sure.

Thanks Sue.