It's probably easier to look up Echinoccactus grusonii on a horticultural source to see what the care instructions are. I have no idea what the final pictogram might mean, doesn't make any sense to me, but according to the RHS https://www.rhs.org.uk/Plants/6253/i-Echinocactus-grusonii-i/Details, this plant gets between 0.1 to 0.5 metres tall, with a width of 0.5 to 1 metre wide - which obviously means it's wider than it's tall, and more or less fits with the pictogram you thought meant height and spread - it clearly does. As for watering, it should be watered as necessary during the growing season, but not at all while its dormant. These don't flower till they're mature, but when they do, it's during summer, usually. In terms of light requirements indoors, a south or west facing window, so that it gets either full sun or half a day's sun.