Applehead Siamese is the popular name for the traditional, old-style Siamese, a sturdier, rounder-headed cat than the long, wedge-headed Siamese of today's show rings. Some registries recognize the type separately as the Thai, while many cats called appleheads are simply pointed cats of Siamese ancestry, so looks and temperament can vary.
Expect a pale body with darker points and vivid blue eyes, a short coat that needs little more than occasional brushing, and a talkative, people-focused personality. In Vegas, that mostly means a cat who lives indoors, follows you from room to room and wants company through the long, hot days. Many dislike long stretches alone, so think about your work schedule before adopting.