Ultralight? Microlight? Weight shift? LSA (ELSA, SLSA), EAB?
In Thailand all this is simplified. We have Ultralight and see a big U on the tail (or somewhere) on your aircraft or HS (hotel sierra). The HS are usually traditional-type certified aircraft (yes like a Cessna) - but not always.
To qualify for an Ultralight your Aircraft needs to be registered and comply with the following limitations:
empty weight not above 250kg
maximum take-off weight not above 500kg
maximum fuel capacity 50ltrs
stall speed not above 35knts
max level speed 90knts