Emperor Claudius introduced three additional letters to the Latin alphabet: Ⅎ, Ↄ, and Ⱶ.
What are some examples of the words in which these letters were used?
The last line of an AD 49 boundary stone uses the Ⅎ twice, representing the consonantal v:
The last line reads: ampliaℲit terminaℲitq[ue]. (Illustrated Introduction to Latin Epigraphy, 118).
According to John Wordsworth, a few other examples include:
VOℲIMVS, ℲOℲEMVS, ARℲALES, ARℲALIVM [...] BOℲE, IOℲI [...] ℲELINA, ℲIR
As for the Ⱶ, its use is largely restricted to words of Greek origin, according to Revilo P. Oliver:
Examples of the use of the letter, according to John Worsdsworth, include:
CⱵCNVS, BⱵBLIOTHECA, and once in GⱵBERNATOR
The remaining letter, Ↄ, has not been found in any published inscriptions, but based on the testimony of Priscian it was meant to represent the sound of bs and ps. (cf. Oliver and Wordsworth)