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I was just wondering what the different codes like A-330, or A-110, is it referring to height?

Does the same thing apply to Buildings, Spans, Earth?

those are used by the russians. they designate A for antenna, and the number is the height in meters.

so A330 would be a 330meter Antenna.

is that meters above ground level or above sea level?

AGL

I am yet to meet a jumper for talks about jumpable objects in terms of MSL. that'd be weird :)

Not really, if the object was at sea level...

Like a DUCK?