What is the meaning of ?

The irrealis/prospective verbal gerund-marking suffix:

  1. what will, one who will, what to, what is, one who is, etc.; used to nominalize a verb in the future or in a general sense.
  2. which will, [something] to, which is, etc.; used as an adnominal, but chiefly for dependent nouns and certain common constructions.
  3. Used to introduce a statement being quoted.

what will, one who will, what to, what is, one who is, etc.; used to nominalize a verb in the future or in a general sense.

which will, [something] to, which is, etc.; used as an adnominal, but chiefly for dependent nouns and certain common constructions.

Used to introduce a statement being quoted.

A genitive case marker chiefly attested after honored animate nouns.

Source: wiktionary.org