What do you call these poem things, like 30days have September

[Lardlizard]

April June and November etc

And know any good ones ?

It's a rhyme mnemonic.

I can't think of any others offhand except
In 1492, Columbus sailed the ocean blue.

1666 London burned

It's a mnemonic device.

Never Eat Shredded Wheat

My Very Easy Method Just Speeds Up Naming Planets. (Does it have to rhyme?)

Richard of York gave battle in vain

Every Good Boy Deserves Football (music)

hath September. Sorry I keep seeing the title and it was distressing me.

Kids prefer cheese over fried green spinach

Was taught this to learn order of taxonomy.
kingdom
phylum
class
order
family
genus
species

Very niche though

i before e except after c

(From a couple of songs used in my class re the Tudors)

Catherine A, then Anne Boleyn,
They were the first to marry him,
Then came Jane and Anne of Cleves,
And Kathering Howard which only leaves
Catherine Parr.
Divorced, beheaded died
Divorced beheaded survived.

And
On the 22nd August 1485,
Out went the house of York,
The Tudors had arrived.

i before e, except after c
when the sound is 'ee'
but e before i is also the way
when the sound is 'ay'

Stil not a unbreakable rule, but good for remembering receipt and neighbour etc.

Never eat chips eat scrummy salad and remain young

(I can't write necessary without saying this to myself. Al least, I hope I'm saying it to myself).

@PaulinePetrovaPosey I always remember it as 1 cup 2 sugars

I always remember it as necessary to wear 1 condom for safe sex
1 c and 2 sss

Doris wins. But they didn't teach me that in year 4!

DS has been taught 'Big Elephants Can Always Understand Small Elephants' to remember how to spell 'because' at school.

Please Keep Charlie's Monkeys And Zebras In Lead Cages Most Securely Guarded: the activity series in chemistry, with potassium being most reactive.

Susan Hates Dead Cats: the value of the card suits in bridge.

Silly Old Horses Chase A Herring To Outer Alaska: trigonometry, also known as SOHCAHTOA.

There's also one about the way chess pieces move. I don't remember the whole rhyme, but it has the lines
"The bishop he moves cornerwise, through pathways unrestricted.
His diocese is but half the board: the rest is interdicted."

Dd had one for trigonometry SOHCAHTOA Sex On Hard Concrete Always Hurts The Other's Arse 😂

We were taught At Sign Of Heat Take Off All Coats And Hats for the trigonometry one. I still use it at work in my very maths based job 30 years on!

No point letting your trousers slip half way
Norman plantagenets Lancaster York tudor stuart hanover windsor

Lucy can't drink milk - Roman numerals
L 50
C 100
D 500
M 1000

Another maths one: All Science Teachers Care, for the order of the trigonometry graphs "all, sin, tan, cos".

There was this really nauseating one about going to bed early: we had it on a record of "rhymes to remember", which had many others such as thirty days hath September. The "early" lines were said in a cheerful teenage girl voice, and the "late" lines were in a grumpy teenage boy's voice.

Go to bed early - wake up with joy.
Go to bed late - cross girl or boy.
Go to bed early - ready for play.
Go to bed late - moping all day.
Go to bed early - no pains or ills.
Go to bed late - doctors and pills.
Go to bed early - grow very tall.
Go to bed late - stay very small.

There's a long one starting "H-Hey little beggar boy, catching newts ..." for the periodic table.

examples.yourdictionary.com/examples-of-mnemonics.html

Willy, Willy, Harry, Steve,
Harry, Dick, John, Harry Three;
One, two, three Neds, Richard Two,
Harries Four Five Six, then who?
Edwards Four Five, Dick the Bad,
Harries (twain) Ned Six (the lad);
Mary, Bessie, James ye ken,
Then Charlie, Charlie, James again
Will and Mary, Anna Gloria
Georges four, Will Fourth, Victoria
Edward Seven next, and then
Came George the Fifth in nineteen ten
Ned the Eighth soon abdicated
Then George the Sixth was coronated
After which Elizabeth
And that's all folks until her death

Kings and Queens of England.