What does It mean If there is 3 circles inside another circle
The circle itself is a universal symbol with extensive meaning. It represents the notions of totality, wholeness, original perfection, the Self, the infinite, eternity, timelessness, all cyclic movement, God (such as 'God is a circle whose centre is everywhere and whose circumference is nowhere' (Hermes Trismegistus)).
It can even symbolize the sun, masculine power; as the soul and as encircling waters, and it is the feminine maternal principle. "It implies an idea of movement, and symbolizes the cycle of time, the perpetual motion of everything that moves, the planets' journey around the sun (the circle of the zodiac), the great rhythm of the universe.
The circle is also zero in our system of numbering, and symbolizes potential, or the embryo. It has a magical value as a protective agent, ...and indicates the end of the process of individuation, of striving towards a psychic wholeness and self-realization" (Julien, 71). [x]
And when there’s three circles it can be used to symbolize anything that there are three of. For examples they are commonly used to represent Christian doctrine of the Trinity (Latin: Trinitas, lit. 'triad', from Latin: trinus "threefold") -- There is One God, who is the Father, Son, and the Holy Spirit.
It is sometimes called the trinity knot or the trinity circle (when a circle is included) and is most often found in areas of Celtic influence. It can represent the three stages of life, particularly in women, described as a maid, mother, and crone. The aspects of the Triple Goddess are named the same, and thus it can also be a symbol of that particular concept.
It can also represent concepts such as past, present, and future; body, mind, and soul; the cycle of life (life, death and rebirth), or the Celtic concept of land, sea, and sky. It can even represent the three fundamental elements – air, water, and earth or the universe which consist of three realms; Albios ("heaven, white-world, upper-world"), Bitu ("world of the living beings"), and Dubnos ("hell, lower-world, dark-world").
It is also sometimes seen as a symbol of protection.
TLDR: Basically the three circles inside another circle means that each one represents something that there are a three of, for example the past, present and future or life, death and rebirth. While the bigger circle that encompasses them symbolizes the unity and/or eternity of all the three parts as a whole.