noun
needle-point holder; frog
A heavy metal base with many upright needles, used to hold flowers in place in ikebana arrangements. Also called a 'frog' in English floral terminology.
See also: 生け花
生け花をするときは、剣山に花を挿します。
When doing ikebana, you insert flowers into the needle-point holder.
生け花 is the art of Japanese flower arrangement, while 剣山 is a specific tool used in that art.
Compound of 剣 (ken, 'sword') and 山 (zan, 'mountain'), referring to the mountain-like cluster of sharp needles.