Stupas
Legend has it that Ashoka built 84,000 stupas commemorating the events and relics of Buddha's life.
Some of these stupas contained networks of walls containing the hub, spokes and rim of a wheel, while others contained interior walls in a swastika (卐) shape.
The wheel represents the sun, time, and Buddhist law (the wheel of law, or dharmachakra), while the swastika stands for the cosmic dance around a fixed center and guards against evil.

"Diamond throne" in Bodh Gaya
Ashoka also built the Diamond Throne in Bodh Gaya, at the location where the Buddha had reached enlightenment some 200 years earlier.
This purely Buddhist monument to the Buddha is a thick slab of polished grey sandstone with Mauryan polish 
The sculpted decorations on the Diamond Throne clearly echoe the decorations found on the Pillars of Ashoka.
The Diamond Throne has a decorative band made of honeysuckles and geese, which can also be found on several of the Pillars of Ashoka, such as the Rampurva capitals or the Sanchi capital.
The geese (hamsa) in particular are a very recurrent symbol on the pillars of Ashoka, and may refer to the devotees flocking to the faith.
The same throne is also illustrated in later reliefs from Bharhut, dated to circa 100 BCE.
Stupas
Legend has it that Ashoka built 84,000 stupas commemorating the events and relics of Buddha's life. Some of these stupas contained networks of walls containing the hub, spokes and rim of a wheel, while others contained interior walls in a swastika (卐) shape. The wheel represents the sun, time, and Buddhist law (the wheel of law, or dharmachakra), while the swastika stands for the cosmic dance around a fixed center and guards against evil.
"Diamond throne" in Bodh Gaya
Ashoka also built the Diamond Throne in Bodh Gaya, at the location where the Buddha had reached enlightenment some 200 years earlier. This purely Buddhist monument to the Buddha is a thick slab of polished grey sandstone with Mauryan polish 
The sculpted decorations on the Diamond Throne clearly echoe the decorations found on the Pillars of Ashoka. The Diamond Throne has a decorative band made of honeysuckles and geese, which can also be found on several of the Pillars of Ashoka, such as the Rampurva capitals or the Sanchi capital. The geese (hamsa) in particular are a very recurrent symbol on the pillars of Ashoka, and may refer to the devotees flocking to the faith. The same throne is also illustrated in later reliefs from Bharhut, dated to circa 100 BCE.
Pillars of Ashoka