He may be known for the virgule, but the feeling of his new exhibition more closely resembles an exclamation mark.
thin sloping line, used as a comma in medieval MSS, 1837, from French virgule, from Latin virgula "punctuation mark," literally "little twig," diminutive of virga "shoot, rod, stick." The word had been borrowed in its Latin form in 1728.
Rare, and ambiguous: slash or comma.
"Virgule" (or rather, Latin "virgula", meaning "little rod" or, vividly enough, "little penis") was the name of a punctuation character shaped like a small slash and used in the Latin writing system much like a modern comma -- hence the ambiguity of this term in modern English.
Compare French "virgule" and Italian "virgola", meaning "comma" (not "slash"); Italian "doppia virgola" and "virgoletta", both meaning "double quote".