What does a double sun line mean?

Short answer: A double sun line usually means two clear sun or Apollo lines under the ring finger. Palmistry often reads it as multiple talents, extra support for recognition or more than one visible work path, not guaranteed fame.

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Read my palm
A close view of the middle of a palm, with the three long creases easy to see

What this means

First confirm that there are two real vertical lines in the Apollo area, not one line plus a shadow, scratch or fork.

Two clear lines can suggest recognition from more than one skill, audience, role or creative channel.

If there are many weak lines instead of two clear ones, the reading changes toward scattered focus, so compare the fate line, head line and both hands.