The phrase "are symbolized" is correct and usable in written English.
It can be used when discussing how something is represented or depicted, often in a metaphorical or symbolic context.
Example: "In the painting, the colors are symbolized to represent the emotions of the characters."
Alternatives: "are represented" or "are depicted".
What I am most certain of is not however the correctness of my present way of analysis, but of the fact that all theory of types must be done away with by a theory of symbolism showing that what seem to be different kinds of things are symbolized by different kinds of symbols which cannot possibly be substituted in one another's places.
The old ways are symbolized by the Dragon's Head Baton, the ancient symbol of the chairman's authority and the cause of as much violence and conspiracy as the election itself.
The other phases of rebirth are symbolized by female solos.
These eight dynamics of survival are symbolized in the eight-pointed cross of the Scientology movement.
The table of standard reduction potentials lists selected half reactions and their corresponding reduction potentials (which are symbolized by E°).
They agree that beginners should learn that sounds, or phonemes, are symbolized by letters that make words.
They are symbolized by a wall of stars, each star representing 100 lives snuffed out far too young.
Earth and water, universal elements, are symbolized by pools in 12 large transparent saucers on a sand-covered stage.
The perils of a Bosox autumn are symbolized by a fallen dead leaf floating aimlessly in a pond.
The recreational, educational, and spiritual aspects of its program are symbolized in its insignia, a blue triangle the three sides of which stand for body, mind, and spirit.
The words Sunni and Shia are not mentioned explicitly, but are symbolized in ways that are clearly recognizable to an Iraqi audience.
