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) ... ;