Radicals ( Radical81) three strokes in Kanji;

dimensional, e.g.

Time;

directional, e.g.

;

logical, e.g.

in Hiragana;

in Hiragana and Katakana: long time ago;

in Kanji: long time; old story;

Kiyuu (name); Kuma (name); Tokuo (family name, surname);

numerological, e.g.

3;

structural, e.g.

long long time ago, whenever dealing with (invisibilities, invisibility, invisible), we had to do (matching rpm, matching speed, matching timing) ... ;

Radicals;