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As a suffix, it indicates first person singular possessive; av (father) becomes avi (my father).
As Yud is the smallest letter, much kabbalistic and mystical significance is attached to it. According to the Gospel of Matthew Jesus mentioned it during the Antithesis of the Law when he says: "One jot or one tittle shall in no wise pass from the law, till all be fulfilled." Jot, or iota, refers to the letter Yud; it was often overlooked by scribes because of its size and position as a mater lectionis. In modern Hebrew, the phrase "tip of the Yud" refers to a small and insignificant thing, and someone who "worries about the tip of a Yud" is someone who is picky and meticulous about small details.
Much kabbalistic and mystical significance is also attached to it because of its gematria value as ten, which is an important number in Judaism, and its place in the name of God. See The Mystical Significance of the Hebrew Letters - Yud
Yāʼ is pronounced in two ways. As a consonant, it is pronounced as a palatal approximant /j/, typically at the beginnings of words. In the middle and end of words, the yāʼ usually (though not always) becomes a long close front unrounded vowel /iː/.
As a vowel, yāʼ can serve as the "seat" of the hamza: ئ.
Yāʼ serves several functions in the Arabic language. Yāʼ with a shadda is particularly used to turn a noun into an adjective,called نسبة. For instance مصر Miṣr (Egypt) → مصري Miṣriyy (Egyptian). The transformation can be more abstract; for instance, موضوع mawdū` (matter, object) → موضوعي mawdū`iyy (objective). Still other uses of this function can be a bit further from the root: إشتراك ishtirāk (cooperation) → إشتراكي ishtirākiyy (socialist); this is often used for creation of native terms for political philosophies: ḥurr (free) becomes ḥurriyy (liberal); muḥāfaẓa (guarding, preservation) becomes muḥāfaẓiyy (conservative).
Typically, Egyptians do not use dots under final yāʼ, both in handwriting and in print, resulting in substantial confusion with alif maqṣūra to those not accustomed to the practice
Wipo Publishes Patent of the Trustees of the University of Pennsylvania, Peter J. Yunker and Arjun G. Yodh for "Uniform Coatings Produced by Suspensions of Anisotropic Particles" (American Inventors)
Feb 20, 2013; GENEVA, Feb. 20 -- Publication No. WO/2013/023110 was published on Feb. 14.Title of the invention: "UNIFORM COATINGS PRODUCED BY...