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Painted 19th century Tibetan mandala of the Naropa tradition, Vajrayogini stands in the center of two crossed red triangles. Via upload.wikimedia.org

Japanese Shuji Mandara, via www.ysbla.org.tw

Japan’s esoteric sects employ a mandala called the Shuji Mandara, or Seed-Syllable Mandala in which the deities are symbolized by their individual seed syllables. The seed syllable (Japanese,
Shuji 種字; Sanskrit, Bijaksara) invokes the essence of the deity. In Japan, Sanskrit seed syllables are written in a script called Shittan 悉曇 (Siddham in Sanskrit) which is derived from the Indian Brahmi script.