They are commonly known as acronyms. Some examples are..
LASER (Light Amplification by Stimulated Emission of Radiation)
POSH (Port Out Starboard Home)
AIDS (Acquired Immune Deficiency Syndrome)
RADAR (RAdio Detection And Ranging)
ROTFL is the initial letters of the words ofRollingOnTheFloorLaughing
An acronym is a series of letters that stand for something (each letter stands for a word). For example, SCUBA (Self Contained Underwater Breathing Apparatus) PFD (Personal Floatation Device) MAD (Mutually Assured Destruction)
ICHTHYS - (ik' this), the Greek word for fish, is the acronym of the initial letters of the Greek words for "Jesus Christ, God's Son, Savior."
an acronym
Stand, for one.
An acronym is an abbreviation formed by combining the initial letters in words or part of a series of words
Equal Employment Opportunity Commission
An acronym is a word made up of the initial letters of a name or phrase. E.g. The acronym NASA stands for National Aeronautics and Space Administration
An acronymis an abbreviation formed from the initial components in a phrase or a word. These components may be individual letters (as in CEO)
characters can sometimes stand for letters, but hieroglyphs stand for whole words.
a word formed from the initial letters of other words (e.g., radar, laser).
An acronym is a word formed from the initial letters of a phrase or a group of words. For example, "NASA" stands for the National Aeronautics and Space Administration. Acronyms are often used to simplify lengthy terms and make them easier to remember and communicate.