What is the dot in this vav?

Question

What is this dot in the word יִוָּדַ֤ע in Mikeitz 41 31.

וְלֹֽא־יִוָּדַ֤ע הַשָּׂבָע֙ בָּאָ֔רֶץ מִפְּנֵ֛י הָרָעָ֥ב הַה֖וּא אַחֲרֵי־כֵ֑ן כִּֽי־כָבֵ֥ד ה֖וּא מְאֹֽד׃

How does it effect the reading of this word?

Answer 1

It's a Dagesh Forte which indicates gemination of the consonant "w". So the word would be read something like Yiwwadha' with a prolonged /w/ sound.

The word is in passive future third-person masculine singular and means "[he] will be known".