✅ Solved! What is this blue flag called which the play button always starts at? (and how did I accidentally enable this feature?)

✅ Solved! It is called |[Toggle "loop playback"]| and it's to the immediate right of the |[Play]| button

https://i.imgur.com/wOLiNW4.png (pic here)

I have no clue how I enabled it but I would love to be able to do it again willingly.

My fat fingers must have inadvertently typed a keyboard shortcut or clicked a button by accident.

Can someone tell me what this blue flag is called? (or what this feature is called?)