OTF fonts with "V" or checkmark

General
1

I have just upgraded to MainType 13.
Could someone please explain why some of the OTF fonts have a little “V” or checkmark, even some of them that are not installed. Not all of the OTF fonts have this.
Thanks for help

MainType 13 OTF fonts
MainType 13 OTF fonts934×421 17.6 KB

2

The V is for Variable fonts.

3

thank you so much for the clarification