an orchestral arrangement of songs or dances from an opera or ballet is called a symphonic poem

Actually, a symphonic poem is a specific type of orchestral composition, but it's not typically an arrangement of songs or dances from an opera or ballet.

A symphonic poem, also known as a tone poem, is a single-movement orchestral piece that tells a story, evokes a mood, or portrays a scene or idea through music. It's a form of program music, meaning it's intended to depict or represent something outside of the purely musical realm.

Symphonic poems were popularized by composers like Franz Liszt, Richard Strauss, and Bedřich Smetana in the 19th century. Liszt, in particular, is credited with popularizing the form. His symphonic poems, such as "Les Préludes" and "Mazeppa," were groundbreaking in their use of orchestral color and their innovative approach to form.