Lettering techniques
From Brickwiki
A variety of lettering techniques have been used over the years by both fans and designers. Not to be confused with stickers or printed lettering, these are means of creating lettering using brick-built solutions.
Lettering Techniques
Lettering on trains (Didier Enjary, Rob Hendrix)
Fonts (Eric Harshbarger)
Engraved Lettering Technique (Brickplayer.com)