The Korean alphabet, also known as Hangul, or Chosongul (officially transcribed Han-geul in South Korea and Chosŏn'gŭl in North Korea), is the native alphabet of the Korean language. It was created during the Joseon Dynasty in 1443, and is now the official script of both North Korea and South Korea, and co-official in the Yanbian Korean Autonomous Prefecture of China's Jilin Province. In South Korea, Hangul is sometimes augmented by Chinese characters, called hanja, whereas in North Korea, hanja is virtually nonexistent.
Hangul is a true alphabet of 24 consonant and vowel letters. However, instead of being written sequentially like the letters of the Latin alphabet, Hangul letters are grouped into blocks, such as 한 han, each of which transcribes a syllable. That is, although the syllable 한 han may look like a single character, it is composed of three letters: ㅎ h, ㅏ a, and ㄴ n. Each syllabic block consists of two to five letters, including at least one consonant and one vowel. These blocks are then arranged horizontally from left to right or vertically from top to bottom. The number of mathematically possible blocks is 11,172, though there are far fewer possible syllables allowed by Korean phonotactics, and not all phonotactically-possible syllables occur in actual Korean words. For a phonological description, see Korean phonology.
An information sign is a very legibly printed and very noticeable placard that informs people of the purpose of an object, or gives them instruction on the use of something. An example is a traffic sign such as a stop sign.
Information signs have been growing in visibility due to the explosion of sign technologies. For hundreds, if not thousands, of years signs were crafted out of wood. Words and images were then hand-painted on the sign. The other traditional way of creating signs dealt with individual constructed letters carved from wood, molded or wrought from metal, which were then individually placed in the appropriate sequence.
While both of these methods are still employed, technology has moved in around them. Woodworking machinery can now be controlled by computers, leading to much greater consistency. Molded signage has changed dramatically with the advent of plastics, which are far more flexible than metal as well as significantly cheaper to produce. Additionally, altogether new sign technologies have come into being, such as computer-cut vinyl signage.