Raqabah

RAQABAH. رقبة
Lit. “The Neck”; pl. riqab. A term used in the Qur’an for a captive slave. Surah iv. 94. “Whosoever kills a believer by mistake, then let him free a believing neck.”
The word is used in India for an enclosed area of land. (See Wilson’s Glossary of Indian Terms.)

Based on Hughes, Dictionary of Islam