What is it called when you take part of the letters in a sentence to make another word that helps remember?

An acronym is a word formed from the first letters of a series of words, like:

* NASA (National Aeronautics and Space Administration)

* SCUBA (Self-Contained Underwater Breathing Apparatus)

* RADAR (Radio Detection and Ranging)

Sometimes, acronyms are formed from the first letters of only *some* words in a phrase, or even from syllables:

* LOL (Laughing Out Loud)

* ASAP (As Soon As Possible)

* BRB (Be Right Back)

Let me know if you have any other questions!