A Pinnacle
- The highest point.
Synonyms: acme, peak, summit
Antonym: nadir
- (geology) A tall, sharp and craggy rock or mountain.
Coordinate term: sea stack
- (figurative) An all-time high; a point of greatest achievement or success.
Synonyms: apex
- (architecture) An upright member, generally ending in a small spire, used to finish a buttress, to constitute a part in a proportion, as where pinnacles flank a gable or spire.