The Simian Line (Masukake): Why It's Called a Lucky Palm and How to Spot It

The simian line—known in Japan as the masukake line—appears when the head line and heart line merge into a single crease that runs straight across the palm. Long celebrated as a sign of strong luck and natural leadership, it's one of palmistry's most talked-about lines. Here's how to spot it and enjoy what it's said to mean.

What Is the Simian Line?

Normally the head line and heart line are two separate creases. When they merge into a single line that cuts straight across the palm, that's called a simian line (masukake in Japanese, sometimes translated as the "hundred grip"). The Japanese name is said to come from the way the line appears as one unbroken stroke when you clench your fist.

Why It's Considered a Sign of Strong Luck

Because the simian line is relatively rare, palmistry has long associated it with intense focus, strong willpower, and the drive to carve out your own path. Legend has it that some famous historical figures had this line, which is why it's sometimes called the "mark of a conqueror" in Japan—though that's best enjoyed as charming folklore rather than fact.

One Hand vs. Both Hands

• On one hand only: often read as someone who seizes their luck through effort.
• On both hands: said to indicate an especially strong personality and firm convictions—a genuinely rare case.
• Right vs. left: for a fun reading, the right hand symbolizes your acquired fortune (your past and future path), while the left reflects your innate fortune (the qualities you were born with).

How to Tell It Apart from Similar Lines

Sometimes the head line and heart line sit so close together that they look connected at first glance, but on closer inspection they're still two separate lines. Check under good lighting to see whether the line is truly one continuous crease. Creating an AI-generated reading from a photo of your palm is a fun way to see the flow of your lines laid out clearly (for entertainment purposes).