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OVERLINE

An overline is a horizontal line placed above a character or group of characters. It is used in typography and notation across several disciplines to indicate different ideas, properties, or operations.

In mathematics, logic, and computer science, an overline commonly denotes negation or complement. For example, ā

In statistics and analysis, a bar over a symbol denotes an average or mean. X̄, read as

In linguistics and phonetics, a macron is a diacritic that appears as a horizontal bar above a

Unicode and typesetting provide several ways to render an overline, including the combining overline diacritic U+0305

can
signify
NOT
a
in
Boolean
logic.
It
is
also
used
to
denote
the
closure
of
a
set
in
topology,
written
as
ā
for
the
closure
of
A,
and
to
indicate
the
complex
conjugate
of
a
complex
number,
z̄
for
the
conjugate
of
z.
“x-bar,”
represents
the
sample
mean
of
a
data
set.
In
number
notation,
an
overline
over
digits
marks
a
repeating
decimal,
as
in
0.\overline{3}
=
0.333….
vowel
to
indicate
length;
while
not
exactly
the
same
as
an
overline,
it
serves
a
related
visual
purpose
in
marking
a
property
of
the
letter.
In
typography,
an
overline
can
also
be
a
stylistic
or
editorial
feature
used
to
emphasize
text
or
denote
specific
notation
in
scientific
writing.
and
the
spacing
character
U+203E
overline.
Rendering
and
availability
depend
on
font
support
and
text
direction.