When creating the bowls, potters try to make them look complete and balanced. And the shape of the foot is a very important part of how the finished bowl will look. Japanese tea bowls have several different traditional foot shapes, or kodai, designs.

竹節高台 Takenofushi Kodai: Bamboo Node Foot	釘彫高台 Kiriichimonji Kodai: Bar Cut Foot
桜高台 Sakura Kodai: Cherry Blossom Foot	三日月高台 Mikazuki Kodai: Crescent Moon Foot
縮緬高台 Chirimen Kodai: Crinkled Cloth Foot	切十文字高台 Kirijumonji Kodai: Cross Cut Foot
切高台 Kiri Kodai: Cut Foot	兜巾 Tokin Kodai: Helmet Foot
四角高台 Shiho Kodai: Four Directions Foot	割十文字高台 Warijumonji Kodai: Four Split Foot
碁石高台 Gokezoko-Kodai: Go Stone Box Foot	二重高台 Niju Kodai: Double Foot
釘彫高台 Kugibori Kodai: Nail Carved Foot	貝尻高台 Kaijiri Kodai: Spiral Shell Foot
撥高台 Bachi Kodai: Shamisen Plectrum Foot	輪高台 Wa Kodai: Ring Foot
蛇ノ目高台 or 普通高台 Janome or Futsuu Kodai: Snake’s Eye Foot	渦巻高台 Uzumaki Kodai: Whirlpool Foot
割一文字高台 Wariichimonji Kodai: Two Split Foot	割高台 Wari Kodai: Split Foot

This useful information was found here.