In some social circles, especially in certain European and Latin American cultures, gently scratching the palm during a handshake is seen as a covert sign of attraction.
A man or woman might do it to silently say:
“I like you.”
“I’m interested.”
“Remember me.”
It’s intimate without being overt — a private moment disguised as a formal greeting.
Often done with the thumb or index finger in a soft, upward stroke.
Fun fact: In some flirtation guides, this is taught as a way to create a memorable, sensual first impression.
2. A Secret Code or Recognition Signal 
Historically, secret societies, fraternities, and military units have used variations of the handshake to identify members.
The palm scratch could be part of a coded handshake, signaling shared membership or allegiance.
Examples:
Freemasons use intricate grips and pressures
College fraternities often have unique handshakes with hidden gestures
Resistance groups during wartime used subtle touches to confirm identity
In these cases, the scratch isn’t romantic — it’s strategic recognition.
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