Fonts for programmers
Courrier: A bad choice
Most programmers use the Courier font.
This font is not readable.
Size 9, it is impossible to distinguish between 0 (zero) O (letter 'O') and 1 (one) l (lowercase L) (Take the test).
Once the font is bold, it is unreadable.
In addition, the wheelbase of characters that add unnecessarily to the playback screen.
Fortunately, there are other fonts more legible and reduce eye strain.
Recommended fonts
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DejaVu Sans Mono (Free)
Link: dejavu.sourceforge.net/wiki/index.php/Main_Page
(or the Bitstream Vera Sans Mono, which is similar. In fact, DejaVu fonts are nothing less than Bitstream, but with a character set and more extensive, it seems, more "free")
This policy is anti-aliasée same size 8 (which may please or not).
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Dina (Free)
Link: www.donationcoder.com/Software/Jibz/Dina/
It is a bitmap font available in sizes 8, 9 and 10, non-antialiasée.
The distinction 0 / O 1 / l is quite clear with fonts, and characters are legible even in bold.
Here is a comparison of Courrier, and Dina DejaVu Sans Mono (click to enlarge):
Links
If you need more programming fonts:
www.dsg4.com/04/extra/bitmap/
www.tobias-jung.de/seekingprofont/
websitetips.com/fonts/pixel/
keithdevens.com/wiki/ProgrammerFonts