However, here are some options depending on the context:
* Notelet: This is a formal, rarely used word for a small note.
* Little note: This is the most straightforward and commonly used option.
* Short note: This emphasizes the brevity of the note.
* Scribble: This refers to a quick, informal note.
* Memo: This is a more formal, short written message.
Ultimately, the best diminutive for "note" depends on the specific situation and the desired tone.