<s>
Portable	B-General_Concept
Compiled	I-General_Concept
Format	I-General_Concept
(	O
PCF	O
)	O
is	O
a	O
bitmap	O
font	O
format	O
used	O
by	O
X	B-Operating_System
Window	I-Operating_System
System	I-Operating_System
in	O
its	O
core	O
font	O
system	O
,	O
and	O
has	O
been	O
used	O
for	O
decades	O
.	O
</s>
<s>
PCF	O
fonts	O
are	O
usually	O
installed	O
,	O
by	O
default	O
,	O
on	O
most	O
Unix-based	O
operating	O
systems	O
,	O
and	O
are	O
used	O
in	O
terminals	O
such	O
as	O
xterm	B-Language
.	O
</s>
<s>
PCF	O
fonts	O
replaced	O
Bitmap	B-Device
Distribution	I-Device
Format	I-Device
due	O
to	O
a	O
slight	O
efficiency	O
increase	O
,	O
however	O
most	O
applications	O
have	O
moved	O
on	O
to	O
scalable	O
fonts	O
.	O
</s>
