On top of his head was an oblong of bare-shaven skull—some caste-mark apparently.
This is their caste-mark, the ark of their covenant, their reason for being what they are.
It smote the offender between the eyebrows, leaving a caste-mark of warm ash to attest the accuracy of his aim.
"They say the caste-mark in his forehead is a real diamond," remarked the Barrister.
caste-mark, stomach, slate-colored continuations, and unctuous speech were all gone.
Leaning forward, she took his head in her hands and kissed him between his eyebrows where the caste-mark should be.