Radicals ( Radical24) two strokes in Kanji;

dimensional, e.g.

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

2555NipponCharacterWritingStrokesCount's one of the characters: ku in Hiragana a.k.a. ku in Katakana;

www.jisho.org radical number 20 ... ;

directional, e.g.

;

logical, e.g.

in Kanji: wrapping enclosure;

Chinese Romanization ( cr) 's one of the characters:

e.g.
b- in Pin Yin;
p- in Wade-Giles;
b- in Yale;

numerological, e.g.

2;

structural, e.g.

wrap things up (i.e. system configuration & setup);

WHAT is system? system is combination of objects;
WHAT is configuration? parameterized (Ref, Val) is configuration; 
WHAT is setup? set provides code sequences (e.g. C Sequence Number) doko WHERE for each functional (stage, state) with functional (active, passive), (foreground, background), (lock, unlock), (on, off), (plus, minus), (positive, negative), (up, down), (zoom-in, zoom-out), ... ;

Radicals;