Circled Number Ten

It labels the tenth item, step or point.

Circled numbers work like tidy labels: steps in instructions, points marked on a map, photo or chart, or a reference to a note. Because the circle sets the number apart from the surrounding text, ⑩ usually reads as a label rather than a quantity, though context decides. In Japanese, Chinese and Korean writing they are a familiar numbering style; in Western texts they turn up in diagrams, puzzles and hand-styled notes.

It is plain text, not a picture: your font draws the ring, so ⑩ looks slightly different from device to device, and a font without it shows an empty box. In a word processor it is a fixed character, not part of automatic list numbering.