Z

(noun) the ending of a series or sequence. Synonyms: omega. Example: "The alpha and the omega, the first and the last, the beginning and the end"--revelation."

(noun) the 26th letter of the Roman alphabet. Synonyms: z, zee, zed, ezed, izzard. Examples: "The british call z zed and the scots call it ezed but americans call it zee." "He doesn't know a from izzard."