I found a note on my phone saying “78,5”.

I don't know what it means, so I googled it.

Could it be this?
It's 78.5" tall.

No, I don't like it.

Could it be this?
It has a diameter of 78,5 cm.

No, I don't need it.

Could it be this?
It's 78,5 cm wide.

No, my shower is good as it is.

Could it be this? One of its sections is 78,5–90 cm wide.

No, as stated earlier, I'm quite happy with my shower already.

Could it be this? It measures 71,5cm, and can be extended to 78,5 cm.

No, I wouldn't even know where to put it.

Could it be this? It's 78,5 cm tall.

Nope.