Territorial limitations are listed in the visible region of the Schengen visa (as opposed to the machine readable region).
For your specific question: "is this meaning that i cannot go to estonia (not that i plan) or that i can go?!", the answer is NO. A restriction against Estonia (issued by a Spanish consulate) would look like...
ESTADOS SCHENGEN (-EE)
Meaning all states except Estonia. The minus sign means 'except' and EE is the abbreviation for Estonia. The text would appear at the top of the harmonized region and would be plainly visible.
For your other question(s): While the text you gave cannot be positively decoded without seeing the visa itself, it is likely you are referring to the 'remarks' section of the Machine Readable Zone. This section is available (as an option) for each member state to use for their own purposes. The best guess is that you are stateless (XXA) you applied in the USA (US) to a Spanish consulate (ES) in a location or code signified by 'T' (possibly turístico). In all events, if you are travelling as stateless you would not expect to see your former nationality identified. But only a scan along with the consulate operations manual can tell for sure.
For the remaining question, if you were issued 9 days then you would want to regulate your itinerary such that you used only 9 days. It may be possible to go underground, but it's emphatically not recommended.