Asian bowl with kanji mark - Possibly Japanese katatsu ware

There is a mark..with i think an s ??

Not the low fired western raku. Looks like a celadon glazed bowl and a black glazed stoneware or porcelain. Pretty sure that’s a kanji mark on the base. So more likely to be a high fired Japanese raku technique but the chattering on the base under the glaze points to a Taiwan or small Asian country of origin imo

Thanks Naomi