Engraving letters of the alphabet on the end grain block presents itself as a challenge for the engraver. If the goal requires a faithful rendering of the letter shapes and curves, then very careful planning and cutting will get you there. Practice and more practice continues as a sound way to achieve mastery.
These are boxwood blocks that I engraved a long time ago for use as part of a letterhead design I was working on. Not perfect by any means but an example to look at for the engraver who wishes to engrave her/his own text.
An ambitious engraver might decide to hand engrave a whole set of type to be used in a letterpress. Quite the challenge I would think. We only need to look to the mastery of engravers like Eric Gill and John Farleigh to see examples of lettering engraved in wood. The latter developed and designed the famous Gill sans font.