The image is funnier once you know what each one actually means… let me explain:
Android is the base. Google’s mobile operating system built on the Linux kernel. The one everyone knows.
Nandroid is a full system backup taken at the NAND flash storage level. When you root an Android device and install a custom recovery like TWRP, one of the first things you do is take a Nandroid backup. It is a complete byte for byte image of your entire system partition, data partition, and boot partition at that moment in time. If you flash a custom ROM and it bricks your device you restore the Nandroid and get back to exactly where you were. It is essentially a system snapshot at the hardware storage level. The rounded dome head in the drawing represents the backup covering the original.
Notdroid is a jab at iOS. The party hat head is the dunce cap. The joke writes itself.
Odroid is a real product line. ODROID devices are single board computers made by Hardkernel, a South Korean company. They are similar to Raspberry Pi but generally more powerful and more expensive. They run Android or Linux and are used for embedded computing, retro gaming emulation, home servers, and development work. The rocket shaped head is a nod to the ODROID branding which has always had a slightly more aggressive performance oriented identity compared to the friendly Raspberry Pi aesthetic.
So the image is simultaneously a backup methodology, an OS comparison jab, and a hardware product reference all using the same mascot silhouette.
Whoever drew this knew exactly what they were doing.
If you understand this explain it 😂