Radicals ( Radical1) one stroke in Kanji;

dimensional, e.g.

ichi One, as numerical number;
Nippon Pronunciation 's characters:
, , ;

directional, e.g.

Itsu (female name); Radical5;

logical, e.g.

in Hiragana: one; best;

a, an, the, a.k.a. articles in English;
first; foremost;
one; one line horizontally at center;
similar to dash character in English; similar to minus sign in math;
singular, as opposed to plural;
the best;

in Kanji: one;

Ichi (family name, name, surname); Iru (name); Itsu (female name);

1 line horizontally; horizontal level;

numerological, e.g.

one;
1;

structural, e.g.

1 line (x variable);
horizontal level, IFF distance (x variable) is defined, something above rules underneath objects;

IFF 1 line vertically; vertical level; also see: Radical2;

IFF result is zero, after function MOD (number, divisor (2)) i.e. even number ... ; also see: Radical7;
IFF result is one, after function MOD (number, divisor (2)) i.e. odd number ... ;

Monbusho level knowledge enhancement 2; idea ♯ 213; BF1 Analysis;

Radicals;