Islam
The three core principles in Shia tradition: Tawhid (Oneness of God), Nabuwwa (Concept of Prophethood), Imama (Concept of Imam)

Buddhism
The Triple Bodhi (ways to understand the end of birth) are Budhu, Pasebudhu, and Mahaarahath. The Three Jewels, the three things that Buddhists take refuge in. Shinto
The Imperial Regalia of Japan of the sword, mirror, and jewel. Daoism
The Three Treasures (Chinese: 三寶; pinyin: sānbǎo; Wade–Giles: san-pao), the basic virtues in Taoism. The Three Dantians
Three Lines of a Trigram
Three Sovereigns: Heaven Fu Xi (Hand – Head – 3º Eye), Humanity Shen Nong (Unit 69), Hell Nüwa (Foot – Abdomen – Umbiculus). Hinduism
The Trimurti: Brahma the Creator, Vishnu the Preserver, and Shiva the Destroyer. The three Gunas found in Samkhya school of Hindu philosophy. The three paths to salvation in the Bhagavad Gita named Karma Yoga, Bhakti Yoga and Jnana Yoga. Zoroastrianism
The three virtues of Humata, Hukhta and Huvarshta (Good Thoughts, Good Words and Good Deeds) are a basic tenet in Zoroastrianism. Norse mythology
Three is a very significant number in Norse mythology, along with its powers 9 and 27. Prior to Ragnarök, there will be three hard winters without an intervening summer, the Fimbulwinter. Odin endured three hardships upon the World Tree in his quest for the runes: he hanged himself, wounded himself with a spear, and suffered from hunger and thirst. Bor had three sons, Odin, Vili, and Vé. Other religions
The Wiccan Rule of Three. The Triple Goddess: Maiden, Mother, Crone; the three fates. The sons of Cronus: Zeus, Poseidon, and Hades. The Slavic god Triglav has three heads.
Relation to specific language impairment and developmental dyslexia
There has been considerable debate over the relationship between APD and Specific language impairment (SLI). SLI is diagnosed when a child has difficulties with understanding or producing spoken language for no obvious cause. The problems cannot be explained in terms of peripheral hearing loss. The child is typically late in starting to talk, and may have problems in producing speech sounds clearly, and in producing or understanding complex sentences. Some theoretical accounts of SLI regard it as the result of auditory processing problems. However, this view of SLI is not universally accepted, and others regard the main difficulties in SLI as stemming from problems with higher-level aspects of language processing. Where a child has both auditory and language problems, it can be difficult to sort out the causality at play.Similarly with developmental dyslexia, researchers continue to explore the hypothesis that reading problems emerge as a downstream consequence of difficulties in rapid auditory processing. Again, cause and effect can be hard to unravel. This is one reason why some experts have recommended using non-verbal auditory tests to diagnose APD. Specifically regarding neurological factors, dyslexia has been linked to polymicrogyria which causes cell migrational problems. Children that have polymicrogyri almost always present with deficits on APD testing. It has also been suggested that APD may be related to cluttering, a fluency disorder marked by word and phrase repetitions.