Radicals ( Radical18) two strokes in Kanji;

dimensional, e.g.

Nippon Syllabary 's one of the characters: n in Hiragana a.k.a. n in Katakana;

www.jisho.org radical number 15 ... ;

directional, e.g.

;

logical, e.g.

a part of ice character; a part of water character e.g. something to dwell like moons with water if right hand side is going to be a line like something very huge which causes strings;
similar to radio;

numerological, e.g.

2;

structural, e.g.

since 2 strings are horizontally heading to right, IFF yellow color lines, e.g. Origin of Sound;

if 90° shift, also see: Radical14;

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Radicals;