Prefix with cycle or code

UNI

["Think of what comes before \"corn\" or \"versal.\""]

This clue plays on the prefix "uni-," which means "one." It fits before "cycle" to make "unicycle" (a one-wheeled bike) and before "code" to form "unicode" (a single computing standard for text). The answer is short and snappy, relying on common words where "uni-" acts as the shared starting piece.