These family crests (In Japanese, KAMON) are called 'Hishi-Mon' in Japan.

Rhombic pine bark in circle

Five-layered rhombuses	Three-tiered rhombuses in circle	Rhombic pine bark	Divided rhombus	Takeda rhombus

Note !!
Family crest of "Takeda Shingen" is "Divided rhombus" rather than "Takeda rhombus".

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Drawing method of Takeda rhombus

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Another way
Exception
"Rhombic pine bark" and "Three-tiered rhombuses"

Connect the two equilateral triangle	Rhombic pine bark	Three-tiered rhombuses

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The symbolism of the rhombus is uncertain, but it has been common in decorative patterns since the Nara Period and appears very frequently in kamon designs. (From 'Family Crests of Japan' ICG Muse, Inc.2001)

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