<s>
A	O
bell-shaped	B-Algorithm
function	I-Algorithm
or	O
simply	O
'	O
bell	O
curve	O
 '	O
is	O
a	O
mathematical	O
function	O
having	O
a	O
characteristic	O
"	O
bell	O
"	O
-shaped	O
curve	O
.	O
</s>
<s>
Hence	O
,	O
the	O
integral	O
of	O
a	O
bell-shaped	B-Algorithm
function	I-Algorithm
is	O
typically	O
a	O
sigmoid	B-Algorithm
function	I-Algorithm
.	O
</s>
<s>
Bell	B-Algorithm
shaped	I-Algorithm
functions	I-Algorithm
are	O
also	O
commonly	O
symmetric	O
.	O
</s>
<s>
Some	O
bell	B-Algorithm
shaped	I-Algorithm
functions	I-Algorithm
,	O
such	O
as	O
the	O
Gaussian	O
function	O
and	O
probability	O
distribution	O
of	O
the	O
Cauchy	O
distribution	O
,	O
can	O
be	O
used	O
to	O
construct	O
sequences	O
of	O
functions	O
with	O
decreasing	O
variance	O
that	O
approach	O
the	O
Dirac	O
delta	O
distribution	O
.	O
</s>
<s>
This	O
is	O
the	O
archetypal	O
bell	B-Algorithm
shaped	I-Algorithm
function	I-Algorithm
and	O
is	O
frequently	O
encountered	O
in	O
nature	O
as	O
a	O
consequence	O
of	O
the	O
central	O
limit	O
theorem	O
.	O
</s>
