lettering(n = noun.communication) inscription - letters inscribed (especially words engraved or carved) on something;
is a kind of piece of writing, writing, written material
has particulars: superscription, epigraph, epitaph

1.  The act or business of making, or marking with, letters, as by cutting or painting. [1913 Webster]

2.  The letters made; as, the lettering of a sign. [1913 Webster]

lettering, n.
1 the process of inscribing letters.
2 letters inscribed.