<s>
Num	B-Device
Lock	I-Device
or	O
Numeric	O
Lock	O
(	O
⇭	B-Device
)	O
is	O
a	O
key	O
on	O
the	O
numeric	B-Device
keypad	I-Device
of	O
most	O
computer	B-Device
keyboards	I-Device
.	O
</s>
<s>
It	O
is	O
a	O
lock	B-Device
key	I-Device
,	O
like	O
Caps	B-Device
Lock	I-Device
and	O
Scroll	B-Device
Lock	I-Device
.	O
</s>
<s>
Its	O
state	O
affects	O
the	O
function	O
of	O
the	O
numeric	B-Device
keypad	I-Device
commonly	O
located	O
to	O
the	O
right	O
of	O
the	O
main	O
keyboard	B-Device
and	O
is	O
commonly	O
displayed	O
by	O
an	O
LED	O
built	O
into	O
the	O
keyboard	B-Device
.	O
</s>
<s>
The	O
Num	B-Device
Lock	I-Device
key	I-Device
exists	O
because	O
earlier	O
84-key	O
IBM	B-Device
PC	I-Device
keyboards	I-Device
did	O
not	O
have	O
cursor	O
control	O
or	O
arrows	O
separate	O
from	O
the	O
numeric	B-Device
keypad	I-Device
.	O
</s>
<s>
Most	O
earlier	O
computer	B-Device
keyboards	I-Device
had	O
different	O
number	O
keys	O
and	O
cursor	O
control	O
keys	O
;	O
however	O
,	O
to	O
reduce	O
cost	O
,	O
IBM	O
chose	O
to	O
combine	O
the	O
two	O
in	O
their	O
early	O
PC	B-Device
keyboards	I-Device
.	O
</s>
<s>
Num	B-Device
Lock	I-Device
would	O
be	O
used	O
to	O
select	O
between	O
the	O
two	O
functions	O
.	O
</s>
<s>
On	O
some	O
laptop	B-Device
computers	I-Device
,	O
the	O
Num	B-Device
Lock	I-Device
key	I-Device
is	O
used	O
to	O
convert	O
part	O
of	O
the	O
main	O
keyboard	B-Device
to	O
act	O
as	O
a	O
(	O
slightly	O
skewed	O
)	O
numeric	B-Device
keypad	I-Device
rather	O
than	O
letters	O
.	O
</s>
<s>
On	O
some	O
laptop	B-Device
computers	I-Device
,	O
the	O
Num	B-Device
Lock	I-Device
key	I-Device
is	O
absent	O
and	O
replaced	O
by	O
the	O
use	O
of	O
a	O
key	O
combination	O
.	O
</s>
<s>
Since	O
Apple	B-Device
Keyboards	I-Device
never	O
had	O
a	O
combination	O
of	O
arrow	B-Device
keys	I-Device
and	O
numeric	B-Device
keypad	I-Device
(	O
but	O
some	O
lacked	O
arrow	B-Device
keys	I-Device
,	O
function	O
keys	O
,	O
and	O
a	O
numeric	B-Device
keypad	I-Device
altogether	O
)	O
,	O
Apple	O
has	O
keyboards	B-Device
with	O
a	O
separate	O
numeric	B-Device
keypad	I-Device
but	O
no	O
functional	O
Num	B-Device
Lock	I-Device
key	I-Device
.	O
</s>
<s>
Keyboards	B-Device
manufactured	O
by	O
Apple	O
will	O
instead	O
use	O
a	O
Clear	O
key	O
but	O
not	O
all	O
Apple	O
manufactured	O
keyboards	B-Device
will	O
be	O
provided	O
with	O
it	O
.	O
</s>
<s>
+	O
Keys	O
affected	O
by	O
Num	B-Device
Lock	I-Device
Key	I-Device
on	O
Numeric	B-Device
Keypad	I-Device
Num	B-Device
Lock	I-Device
On	O
Num	B-Device
Lock	I-Device
Off	O
1	O
1	O
End	B-Device
2	O
2	O
Down	B-Device
Arrow	I-Device
3	O
3	O
Page	B-Device
Down	I-Device
4	O
4	O
Left	B-Device
Arrow	I-Device
5	O
5	O
does	O
nothing	O
(	O
usually	O
)	O
6	O
6	O
Right	B-Device
Arrow	I-Device
7	O
7	O
Home	B-Device
8	O
8	O
Up	B-Device
Arrow	I-Device
9	O
9	O
Page	B-Device
Up	I-Device
0	O
0	O
(	O
zero	O
or	O
comma	O
)	O
Insert	B-Device
.	O
</s>
