pinholder
/ˈpɪnˌhəʊldə/noun
1Chiefly Engineering. A device for securing a pin.
2A receptacle for storing pins (especially hairpins or dressmakers' pins), a pin box; a pincushion.
3A holder for cut flowers and foliage, comprising a mounting or base with projecting pins to grip the stems.
Origin
Mid 19th century; earliest use found in Scientific American. From pin + holder.