An acrostic a form of writing in which the first letter, syllable or word of each line, paragraph or other recurring feature in the text spells out a word or a message. For example, to remember the planets in order, use:
My
Very
Excellent
Mother
Just
Served
Us
Nachos
Mercury
Venus
Earth
Mars
Jupiter
Saturn
Uranus
Neptune
Also called Phonetic Number System.
Pick a location you're familiar with -- your school, your library, your grandmother's house, whatever. Imagine walking through each room, and seeing something different in each room -- either an object, or an action being performed. The things, of course, can be visually linked to the things you're remembering. As you mentally walk through the structure, you get reminded of each bit in turn. Just remember a path through the structure, and you remember the things in order.
Create a story where each word or idea you have to remember cues the next idea you need to recall.
An acronym is an invented combination of letters.