A franc is a single monetary unit of currency like the US dollar in singularity but not in value. The franc is significantly less than the dollar and no longer exists in certain European countries.
Positive: Spiritually speaking, the Franc can represent the heart of man because the Bible says, “for where your treasure is, there will be your heart be also.” This makes passages like, “The tongue of the just is as choice silver: the heart of the wicked is little worth.” make sense and deepens our understanding to connect money with words, hence “I have rejoiced in the way of thy testimonies, as much as in all riches.” Dreaming of an abundance of Francs could symbolize prosperity.
Negative: Dreaming of someone replacing your US dollars with Francs could represent being ripped off or being in debt or lack.
(Proverbs 10:20; 3 John 1:2; John 4:36; Jeremiah 22:13; Haggai 1:6; Romans 6:23).