>>50047816There is a variation of a holographic pattern on modern holos (and old holos, really) that include a swirl-like pattern. Other variations on modern cards include a 'tornado' or 'galaxy' swirl, seen in the center of pic related.
Swirls are usually rarer to find on cards, and even then, each swirl will be different due to how the holo pattern is cut and placed on a card. Thus, swirled cards will always be sold as more expensive. Older WOTC-era cards have different variations like BUGS and Xs, but normies only care about swirls.