(Ceramic) tiny split in the base from manufacturing --is there a name for this?

I have two pieces I'm planning to list this week, both have small manufacturing flaws (splits? folds?) on the bottom. Is there a term for this?

A Ken Edwards vase, right in the center, this is a miniature vase, photo approximately 2x.



And a Beswick, bottom left.



Just wondered how to describe, whether to describe. Not really anything that impacts the piece, both stand perfectly with no chips, cracks or repairs.

Thanks.

 

A firing crack. You can say it's stable and happened in the kiln, but better to say firing flaw. Once "crack" enters the description, all hope is lost.

 

I'm going with "Firing flaw". Thanks! I actually never noticed it on the Beswick until I took photos of the base and spotted it when I loaded the photos. (Definitely avoiding the word "crack".)