spectacle

An exciting or extraordinary scene, exhibition, performance etc.

An embarrassing or unedifying scene or situation.

(usually in the plural) An optical instrument consisting of two lenses set in a light frame, worn to assist sight, or to protect the eyes from bright light.

(obsolete) A spyglass; a looking-glass.

The brille of a snake.

(rail transport) A frame with different coloured lenses on a semaphore signal through which light from a lamp shines at night, often a part of the signal arm.