EL Brackets to remove the original meanings of the contents
rl
and
rr
ASCII:
[ and ]
#rl is the line covering out of the left side of the frame, and #rr is the
line covering out of the right side of the frame.

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ここでは手話と音声記号のみ示しています。解説は意味抜き括弧のページをご覧ください
The hand signs:
rl 

making the bracket shape with the thumb as the lower position and the index.
rr 

making the bracket shape with the thumb as the higher position and the index
The function:
The character(s) in one or both of these brackets loose the meaning which
originally have,
and the new symbols can be used for any definitions temporally as the users' setting.
The examples of these usage are
here.
The name of both 
:

[ni:t]
The name of the left bracket
:



[nju:t]:
added the extended vowel of
in the base name 
[su] of
( pointing the left)
The name of the right bracket
:
.
.
. EL System . 地球語のしくみ