Sanbonashi

'Three legs', referring to tapered prongs of skin left bare on the whitened neck of geisha and maiko, for very formal occasions. At all other times it is just two
Found on http://www.wafuku.co.uk/glossary.htm

Sanbonashi

The three prongs of flesh colour at the back of a geisha/geiko and miko's neck when they wear mwhite make up. Sanbonashi means three legs, and is worn on formal occasions. Only two are worn on informal occasions
Found on http://www.wafuku.co.uk/glossary.htm
No exact match found