This file is indexed.

/etc/brltty/Text/brf.ttb is in brltty 5.4-7+deb9u1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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###############################################################################
# BRLTTY - A background process providing access to the console screen (when in
#          text mode) for a blind person using a refreshable braille display.
#
# Copyright (C) 1995-2016 by The BRLTTY Developers.
#
# BRLTTY comes with ABSOLUTELY NO WARRANTY.
#
# This is free software, placed under the terms of the
# GNU Lesser General Public License, as published by the Free Software
# Foundation; either version 2.1 of the License, or (at your option) any
# later version. Please see the file LICENSE-LGPL for details.
#
# Web Page: http://brltty.com/
#
# This software is maintained by Dave Mielke <dave@mielke.cc>.
###############################################################################

# BRLTTY Text Table - Braille Ready Format (for viewing .brf files within an editor or pager)

char	\s	(      )

glyph	A	(1     )
glyph	B	(12    )
glyph	C	(1  4  )
glyph	D	(1  45 )
glyph	E	(1   5 )
glyph	F	(12 4  )
glyph	G	(12 45 )
glyph	H	(12  5 )
glyph	I	( 2 4  )
glyph	J	( 2 45 )

glyph	K	(1 3   )
glyph	L	(123   )
glyph	M	(1 34  )
glyph	N	(1 345 )
glyph	O	(1 3 5 )
glyph	P	(1234  )
glyph	Q	(12345 )
glyph	R	(123 5 )
glyph	S	( 234  )
glyph	T	( 2345 )

glyph	U	(1 3  6)
glyph	V	(123  6)
glyph	X	(1 34 6)
glyph	Y	(1 3456)
glyph	Z	(1 3 56)
char	&	(1234 6)
char	=	(123456)
char	(	(123 56)
char	!	( 234 6)
char	)	( 23456)

char	*	(1    6)
char	<	(12   6)
char	%	(1  4 6)
char	?	(1  456)
char	:	(1   56)
char	$	(12 4 6)
glyph	]	(12 456)
glyph	\\	(12  56)
glyph	[	( 2 4 6)
glyph	W	( 2 456)

char	1	( 2    )
char	2	( 23   )
char	3	( 2  5 )
char	4	( 2  56)
char	5	( 2   6)
char	6	( 23 5 )
char	7	( 23 56)
char	8	( 23  6)
char	9	(  3 5 )
char	0	(  3 56)

char	/	(  34  )
char	+	(  34 6)
char	\#	(  3456)
char	>	(  345 )
char	'	(  3   )
char	-	(  3  6)

glyph	@	(   4  )
glyph	^	(   45 )
char	_	(   456)
char	"	(    5 )
char	.	(   4 6)
char	;	(    56)
char	,	(     6)

# For convenience, lowercase alphabetic characters are also defined
# so as to have readable text when not viewing a .brf file
# (like BRLTTY's config menu for switching to another braille table).
char	a	(1     )
char	b	(12    )
char	c	(1  4  )
char	d	(1  45 )
char	e	(1   5 )
char	f	(12 4  )
char	g	(12 45 )
char	h	(12  5 )
char	i	( 2 4  )
char	j	( 2 45 )
char	k	(1 3   )
char	l	(123   )
char	m	(1 34  )
char	n	(1 345 )
char	o	(1 3 5 )
char	p	(1234  )
char	q	(12345 )
char	r	(123 5 )
char	s	( 234  )
char	t	( 2345 )
char	u	(1 3  6)
char	v	(123  6)
char	w	( 2 456)
char	x	(1 34 6)
char	y	(1 3456)
char	z	(1 3 56)

# The following additional characters need to be defined
# because some .brf files contain non-standard characters
# and because some braille translators output non-standard characters.
char	{	( 2 4 6)
char	}	(12 456)
char	|	(12  56)
char	~	(   45 )
char	`	(   4  )
glyph	\X7F	(   456)