if this is checked http://wiki.mikrotik.com/wiki/Manual:Product_Naming

then still unclear, what are acronymes SXT and hEx stands for?

hEX - home Ethernet eXchange, not sure about SXT, my best guess it is short of Sextant, as SXT products are down-scaled Sextant products.

to continue:

hAP = home access point
cAP = ceiling access point
wAP = wall access point
mAP = micro access point
LHG = light head grid
mANT = mikrotik antenna
qrt = quadrant