EL Definition Brackets
dl
and dr
ASCII: ( and )
#dl (the left bracket for the definition system) shape covers out of the
left and the bottom lines of frame,
and #dr (the right bracket for the definition
system) shape covers out of the right and the bottom lines of frame

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ここでは手話と記号名のみ載せています。使い方や使用例の日本語解説は表意括弧のページへどうぞ。
The hand-signs:
dl 

A large turning movement from the shoulder level
to the waist level, drawing the base shape,
keeping the hand shape in the same way.
Be careful to distinguish from #pl movement.
dr 

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.
Be careful to distinguish from #pr movement.
The name of both 
:



[da:t]:
arranged from the base name 
[da] of
( container for holding 'meanings'),
the vowel is extended to show there is some contents, and the phonetics
of
( means
'cover, holder' ) positions at the end for distinguishing brackets from names
of general bases.
The function:
# To show that the characters in them represent definitions.
# To bundle an internal sentence in a complex sentence.
# To hold some contents for conversation, classification, explanation and
etc. between dl and dr, distinguishing the types of contents by putting a specific
base/base overlay in dl only or both brackets depending on the length/clearness of
the contents.
The name of the left bracket only
:



[dau:t]:
added the extended vowel of
in the base name 
[su] of
(pointing the left).
The single usage of this putting other character in:
To show that the following character(s) is/are a name, logo or abbreviation;
also to inform about what kind that name is classified to.
The name of the right bracket
:



[dae:t] :
added the extended vowel of
in the base name 
of
(pointing
the right)
The single usage of this putting other character in:
To create abbreviations and logos putting other character(s) in, shortened
from the original meaning. When you see a base overlay with this, it's always a logo
or an abbreviation of some meaning.
The details of these functions and the examples are
here.
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