The design is called a splayed pin fin heat sink.

The rounded pins present minimal resistance to incoming air streams and Incoming air streams can enter from all directions (omnidirectional).

Round pins generate extensive air turbulence.

I'm guessing the more splayed the pins, the greater the air turbulence and it allows for air movement in all directions; the time / gps chipsets are meant to run cool.

Straight long fins heatsinks would be greatly hampered by the small fan that only produces a big airflow for a small number of fins.

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