definition

 An alphabet is a standard set of letters (basic written symbols or graphemes) which is used to write one or more languages based on the general principle that the letters represent phonemes (basic significant sounds) of the spoken language.

A street sign is a type of traffic sign used to identify named roads, generally those that do not qualify as expressways or highways. Street signs are most often found posted at intersections, and are usually in perpendicularly oriented pairs identifying each of the crossing streets. 

                                          

a paid announcement, as of goods for sale, in newspapers or magazines, on radio or television, etc. the action of making generally known; a calling to the attention of the public:    

In modern astronomy, a constellation is a specific area of the celestial sphere as defined by the International Astronomical Union (IAU). These areas had their origins in star patterns from which the constellations take their names. There are 88 officially recognized constellations, covering the entire sky. When astronomers say an object is "in" a given constellation, they mean it is within the boundaries of one of these defined areas of sky 

ASCII ( ⁱ/ˈæski/ ASS-kee), abbreviated from American Standard Code for Information Interchange, is a character-encoding scheme. Originally based on the English alphabet, it encodes 128 specified characters into 7-bit binary integers as shown by the ASCII chart on the right.

An electronic symbol is a pictogram used to represent various electrical and electronic devices (such as wires, batteries, resistors, and transistors) in a schematic diagram of an electrical orelectronic circuit. These symbols can (because of remaining traditions) vary from country to country, but are today to a large extent internationally standardized. Some symbols represent components which ceased to be used routinely as newer technologies were introduced (such as vacuum tubes) 

Morse code is a method of transmitting text information as a series of on-off tones, lights, or clicks that can be directly understood by a skilled listener or observer without special equipment. The International Morse Code^[1] encodes the ISO basic Latin alphabet, some extra Latin letters, the Arabic numerals and a small set of punctuation and procedural signals as standardized sequences of short and long signals called "dots" and "dashes",^[1] or "dits" and "dahs". Because many non-English natural languages use more than the 26 Roman letters, extensions to the Morse alphabet exist for those languages. 

American Sign Language (ASL) is the predominant sign language of deaf communities in the United States and English-speaking parts of Canada. Besides North America, dialects of ASL and ASL-basedcreoles are used in many countries around the world, including much of West Africa and parts of Southeast Asia. ASL is also widely learned as a second language, serving as a lingua franca. ASL is most closely related to French Sign Language (FSL). It has been proposed that ASL is a creole language, although ASL shows features atypical of creole languages, such as agglutinative morphology. 

In typography, a glyph /ˈɡlɪf/ is an elemental symbol within an agreed set of symbols, intended to represent a readable character for the purposes of writing and thereby expressing thoughts, ideas and concepts. As such, glyphs are considered to be unique marks that collectively add up to the spelling of a word, or otherwise contribute to a specific meaning of what is written, with that meaning dependent on cultural and social usage.