What do the numbers mean after the letters when tuning?

I see E3 E4 E5 etc..Iv never understood it.Can someone help me?
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maybe the octave of the note, not really sure.
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maybe the octave of the note, not really sure.

I believe you're correct.
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from what I've heard, it is the octave.
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its the number of octaves from the lowest on a piano.
so, E5 would be the fifth E from the bottom E on a piano.
The note represents the note, the number tells you what octave, but that's been covered already.
Honestly though, I don't mean to sound rude, but stuff like this doesn't belong in the Advanced Technique forum, as tbh it's not particularly advanced and it's not a technique.