: inner direction/inside/inward (内), : outer direction/outside/outward (外)
An EL writing goes from the left to the right, so the users feel the left as the original direction and the right as the heading direction or the direction against the subject. Then these symbols are mainly used by the above meanings.
By the same reason, when these were compounded with (time), means the past, and means the future seeing from the present, distinguishing with (earlier/early) and (late/later) seeing from any time point. When compounded with a verb mark, the verb is for a past verb and is for a future verb.
[Prepositions] (compounding with preposition mark) : in, : at out of ...
inner surface (内面), :
outer surface (外面)
: on the inner surface of ...(a preposition)
Compounding with (wall/壁),
: inner wall (内壁), : outer wall (外壁)
: ceiling (天井), : floor (床)
Compounding with (building/建物),
: interior (室内), : exterior (屋外)
: roof (屋根), : foundation of building (建築基礎)
(much/多) or (less/少):
: deep inside (奥深い), : far (遠い),
: shallow inside (中に浅い), : close (近い)
Compounding or with a symbol of a condition, it shows a movement/phenomenon/situation related to inside/inward or outside/outward.
and unrelated to the meaning of Inside and Outside(内外とは無関係の意味で)
These two symbol-shapes point the opposition direction to each other. So they are used for the left and the right (compounding with ), for west and east (compounded with ), for oneself and other (with ), and for female and male (with ). Various family relatives such as mother and son are shown using (female) or (male) and (earlier) or (later) or (equal level) etc.
Like these ways, many symbols are simply expressed, and are visually understandable. Pages 19 and 20 of the main dictionary have more of these examples.
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