pl
and pr
ASCII: { and }
#pl (the left bracket for the phonetic system) shape is covering out of
the left and the top lines of the frame,
and #pr (the right bracket for the phonetic system) shape is covering out
of the right and the top lines of the frame.
(表音括弧は文字枠を上と左、上と右で覆う形です。)
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See here for the usage of these
phonetic brackets.
(表音左括弧と右括弧：この使い方については表音括弧をご覧ください)
hand-sign:
a large turning movement from
the shoulder level to the waist level,
drawing the base shape:
the hand shape stays the same.
#pr 
hand-sign:
a large turning movement from
the shoulder level to the waist level,
drawing the base shape:
the hand shape changes to the fist lightly at the end.
(括弧は肩の高さからウエストにかけて平手で描きます。
括弧の左右は手の左右ではなくて、上から回して横に
なったときに手をそのままの形に保つか握るかで違いを表します。)
The name of both: 
[mi:t] The sound of meet :
of the base 
in 
(
means 'voice, phonetic' ) 
(means 'cover, holder') in phonetics positions at the end for distinguishingThe function:
Showing that the characters in them represent
phonetics/
To classify phonetics putting other base or number in one or
both of them
and bundling the sounds.
[mju:t] the sound of mute in English:
in the base name 
[su] of 
( pointing the left)
The single usage of this putting other character in:
showing
the type of the phonetic classification.
[mje:t] (as one long syllable ) :
in the base name 
of 
( pointing
the right)
The single usage of this putting other character in:
To
create logos or abbreviated names shortened from the original names or phonetics.
When you see a base overlay with this, it's always a kind of shortened name (sound).
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