Natyashastra
वामश्चैव स्वभावस्थः सूचीपादः प्रकीर्तितः । नृत्ते नूपुरकरणे प्रयोगस्तस्य कीर्त्यते ॥ २८०॥
The left foot, naturally positioned, is called the "Sūchīpāda" (needle-like foot). Its use is mentioned in dancing and in the application of ankle bells (nūpura).
english translation
vAmazcaiva svabhAvasthaH sUcIpAdaH prakIrtitaH । nRtte nUpurakaraNe prayogastasya kIrtyate ॥ 280॥
hk transliteration by Sanscript