I cannot figure this one out. The letters 'fi' as in firewall or firefox would be replaced within synaptic as a phone; not a modern cellphone but one of those museum pieces you'd find at your yard sale or flea market. I tried changing the font, too, with an application type or terminal font. I don't think the font size can fix it either. But thankfully it is not a showstopper -- just an annoyance. You can look at the screenshot here
fi like phi the greek letter?
I think like firefox, configuration, etc
weird then, i have no idea