Usually when I design a PCB, I name the LEDs as
LED2, ... , but now I'm working on a set of boards where I do not have much space for the component names on the silkscreen.
The boards are divided in four functional blocks.
In order to be able to better identify which parts belongs to which functional block, I'm naming
R102, ..., for functional block 1,
R202, ..., for functional block 2, and so on.
The problem is that it generates very large names for LEDs,
So in order to solve this problem I replaced
It was ok, since at the time, I didn't had diodes on the board, but now I need to use diodes and I want to easily distinguish which components are LEDs and which are diodes, but I don't have space to have
LED101 on the silkscreen.
Is there any convention for one letter prefix to use for LEDs that is different for diodes?