Radical : Radical : Radical : ( Radical794) twelve strokes in Kanji;

dimensional, e.g.

;

directional, e.g.

;

logical, e.g.

in Hiragana: axis; axle; shaft;

center; centre;
focal point, a.k.a. key point;
hanging scroll;

in Kanji: axis; pivot;

counter for book scroll;
stalk; stem;

Jiku ... ;

numerological, e.g.

3;

structural, e.g.

sanjiku Triaxial ( X, Y, Z) ... ;

nijiku Biaxial ( X, Y) ... ;

ichijiku Uniaxial ( X) ... ;

Radical ; Radical ; Radical ; Radicals;