Strange values on disc capacitors

[Victor Frankenstein]

What do the strange values on disc capacitors signify exa 005 and
5D 1KV , why can't they just be abbreviated in a more intuative way like for exa just 10 micro farads ?

Also for a small mic how can I tell apart which ends which + or 1 and what do the letters HAI signify on some small mics I've seen ?

 

[rayjohn01]

Not entirely sure but disk caps come in a variety of types , they should try to tell you
voltage rating
capacitance
material and tolerance
maybe there's just not enough space without some coding format.
Ray.