Pad

https://en.wikipedia.org/wiki/Paduka

https://www.google.com/search?q=Paduka+Devi

Legend
http://01so.blogspot.com/search/label/DivineConch

Vishnupad 
http://ncest.blogspot.com/search/label/Gaya
http://laxmivishnu.blogspot.com/search/label/ParamaPadam

Structure
http://www.rudraksham.com/catalog/46/0/Puja-Items--Charan-Paduka

Sahasram
http://00sr.blogspot.com/search/label/PadukaSahasram

Guru
http://0sh8.blogspot.com/search/label/GuruPadukaPanchakam