Crossword puzzle clue "sign on a switch"

Sign on a switch

Good sign or bad sign

Warning sign at a train station's food court? (NOTE: The original sign, without my additions, actually exists. It's in Grand Central Terminal in NYC, on the lower level — the food court level. The sig

Sign of danger — sign of socialism

Pre-sign sign

Calculator that has no on-off switch

Spendthrift's credo, with an easy switch

Kind of music, with an easy switch