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What exactly does this symbol represent, and how is it different from a regular PNP transistor?

one base, two emitters, two collectors

If it is something more than a basic transistor, how would one model it in a simple circuit simulator?

From page 8 of LM78L05 datasheet

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It's a double Collector pnp (the arrow represents the emitter), and can also be interpreted as a current mirror, since it appears to be 2 pnp with shared Emitter and Base.

You can simulate it with 2 transistors, in a mirror configuration.

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