What Is It Called When Letters Stand For A Phrase

What Is It Called When Letters Stand For A Phrase
What Is It Called When Letters Stand For A Word
What Is It Called When A Few Letters Stand For A Phrase
What Is It Called When Each Letter Stands For A Word
What Is It Called When Every Letter Stands For A Word
What Is It Called When Letters Mean A Word
What Is It Called When Each Letter Stands For Something In A Word
What Is It Called When A Words Letters Stand For Something
What Is It Called When Each Letter Stands For Something
What Do You Call It When Each Letter Of A Word Stands For Something