Sorry if this is the wrong place to post this enquiry (I can't access email atm)!

Please can someone explain the meaning of recursive fic for these medium opt-ins? I think I get it, but want to be sure :)

Recursive Fic of Any of the Recip's Gifts In This Fandom (W/ Permission From Author!): 1k written
Recursive Fic of Any of the Recip's Works In This Fandom: 1k written

Thanks so much!