Isn't It Iron Pick
Isn't It Iron Pick, is likely referring to the minecraft advancement.

The advancement itself is a reference to the well-known pop song "Ironic" by Alanis Morissette.
The lyrics are as follows; "And isn't it ironic? Don't you think".

The advancement in and of itself is also a pun on the word "ironic".
"Isn't It Iron Pick: Upgrade your pickaxe"