Not really "gibberish" if you know what it is means. (I see, said the blind man.)
Those top corner numbers are simply part numbers. They are not meaningful for what you want to know.
The info on the back is what is important to you (of course, you said it is on the plug, and I find that curious).
The input numbers "120V~ 0.15A, 60Hz"
mean it requires an input supply of 120 VAC (Alternating Current, actually US voltage can be anywhere between 110 to 122 VAC, and it is typically stated as being 120 VAC) but don't worry about that, as long as you are somewhat near that.
The supply will require 0.15 amps of current. That really isn't much, it comes out at about 18 watts, or a lot less than what most incandescent light bulbs you might have, lighting a small area.
The 60Hz is the frequency of the AC input current, or 60 cycles per second.
60Hz is the standard frequency of the United States.
In Europe the standard, in many places, is just 50Hz, and because your label does not state that (which usually say "50-60Hz") then this is not good for European travel.
You can get cheap travel converters for when you travel, and they have adapters for the many different European types of plugs (in the US we have one type) and the adapters can also adjust your supply voltage between 100 and 220 Volts - with 220 being pretty common, but not a standard, in Europe.
BUT! the Hz (Hertz, cycles per second, or cps) is not the thing that can easily, or cheaply, be changed. If the plug does not specifically say the 50Hz range, I WOULD NOT chance it.
(Yes there are adapters that will convert 60 to 50 Hz, but they get expensive - $100 to $250, and bulky to carry. Just not worth it for a PDA.)
If you plug a 60Hz device, like a power supply, into 50Hz (considering you do adapt for the proper voltage) while it might initially work, what will happen, in time, is that the transformers inside will heat up and possibly create smoke and/or fire.
The "DC output: 5.0v--1.0 A" means
that the voltage/current output is capable of supplying direct current (like a battery is direct current) of 5 volts and a maximum current of 1 Amp.
That is just 5 watts, and fairly typical.
If this is the power supply that came with the PDA then don't worry about the output supply at all. It is designed to power your PDA as long as you observe the correct input voltages (and current and frequency) which is important.
In a previous message you said "My palm charges very nicely on USA 170 voltage"
I am sure that is a typo, right? 170 volts is not nice USA anything. I believe you meant 120 volts, right?