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تابع nan برای نمایش حاصل عبارات نامعین (مانند تقسیم صفر بر صفر) به کار می رود. این نماد با هیچ عدد دیگری برابر نیست؛ حتی خودش! عبارت nan مخفف شده عبارت Not a Number است.