<s>
A	O
ruling	B-Application
pen	I-Application
is	O
a	O
drawing	O
instrument	O
for	O
drawing	O
with	O
ink	O
or	O
with	O
other	O
drawing	O
fluids	O
.	O
</s>
<s>
Originally	O
used	O
for	O
technical	B-Application
drawings	I-Application
in	O
engineering	O
and	O
cartography	O
together	O
with	O
straight	O
rulers	O
and	O
French	O
curves	O
,	O
it	O
is	O
today	O
used	O
for	O
specific	O
uses	O
,	O
such	O
as	O
picture	O
framing	O
or	O
calligraphy	O
.	O
</s>
<s>
A	O
ruling	B-Application
pen	I-Application
contains	O
ink	O
in	O
a	O
slot	O
between	O
two	O
flexible	O
metal	O
jaws	O
,	O
which	O
are	O
tapered	O
to	O
a	O
point	O
.	O
</s>
<s>
In	O
the	O
Soviet	O
Union	O
,	O
ruling	B-Application
pens	I-Application
were	O
widely	O
used	O
by	O
women	O
for	O
eyebrow	O
hair	O
removal	O
,	O
being	O
used	O
as	O
tweezers	O
.	O
</s>
