Noun

(en noun)

A sign made to give notice of some occurrence, command, or danger, or to indicate the start of a concerted action.

* Milton

All obeyed / The wonted signal and superior voice / Of this great potentate.

An on-off light, semaphore, or other device used to give an indication to another person.

(of a radio, TV, telephone, internet, etc) An electrical or electromagnetic action, normally a voltage that is a function of time that conveys the information of the radio or TV program or of communication with another party.

My mobile phone can't get a signal in the railway station.

A token; an indication; a foreshadowing; a sign.

* Shakespeare

The weary sun / Gives signal of a goodly day to-morrow.

* De Foe

There was not the least signal of the calamity to be seen.

Useful information, as opposed to noise.

(computing, Unix) A simple interprocess communication used to notify a process or thread of an occurrence.

Noun

(en noun)

A grouping based on shared characteristics; a class.

* {{quote-magazine, date=2012-03

, author=Lee A. Groat, volume=100, issue=2, page=128, magazine=(American Scientist) , title= Gemstones , passage=Although there are dozens of different types of gems, among the best known and most important are diamond, ruby and sapphire, emerald and other gem forms of the mineral beryl, chrysoberyl, tanzanite, tsavorite, topaz and jade.}}

An individual considered typical of its class, one regarded as typifying a certain profession, environment, etc.

* 2002 , Pat Conroy, The Great Santini , page 4:

"I just peeked out toward the restaurant and there are a lot of Navy types in there. I'd hate for you to get in trouble on your last night in Europe."

An individual that represents the ideal for its class; an embodiment.

* 1872 , Mary Rose Godfrey, Loyal , volume 3, page 116:

Altogether he was the type of low ruffianism — as ill-conditioned a looking brute as ever ginned a hare.

(printing, countable) A letter or character used for printing, historically a cast or engraved block.

# (uncountable) Such types collectively, or a set of type of one font or size.

# (chiefly, uncountable) Text printed with such type, or imitating its characteristics.

The headline was set in bold type .

(biology) An individual considered representative of members of its taxonomic group.

Preferred sort of person; sort of person that one is attracted to.

(biology) A blood group.

(theology) An event or person that prefigures or foreshadows a later event - commonly an Old Testament event linked to Christian times.

(computing theory) A tag attached to variables and values used in determining which kinds of value can be used in which situations; a data type.

(fine arts) The original object, or class of objects, scene, face, or conception, which becomes the subject of a copy; especially, the design on the face of a medal or a coin.

(chemistry) A simple compound, used as a mode or pattern to which other compounds are conveniently regarded as being related, and from which they may be actually or theoretically derived.

The fundamental types used to express the simplest and most essential chemical relations are hydrochloric acid, water, ammonia, and methane.

(mathematics) A part of the partition of the object domain of a logical theory (which due to the existence of such partition, would be called a typed'' theory). (''Note : this to the notion of "data type" in computing theory.)

* Types, theory of. V.N. Grishin (originator), Encyclopedia of Mathematics . URL: http://www.encyclopediaofmath.org/index.php?title=Types,_theory_of&oldid=14150

Logics of the second and higher orders may be regarded as type -theoretic systems.

Categorial grammar is like a combination of context-free grammar and types .