2008 Start of #bitcoin 50 BTC/10min

2012 #Bitcoin halving 50->25

2016 #Bitcoin halving 25->12.5

2020 #Bitcoin halving 12.5->6.25

2024 #Bitcoin halving 6.25->3.125

2028 #Bitcoin halving 3.125->1.5625

2032 #Bitcoin halving 1.5625->0.78125

These all refer to the bitcoin mining prize being cut in half every 4 years.