4.5" Crown of Thorns | Euphorbia Milii
This succulent can often been seen blooming indoors all year long! Make sure it's getting enough light and you may want to wear gloves when handling it... those thorns are sharp!
Bright indirect to direct light. Make sure your plant is getting several hours of bright light daily. Water when the soil is completely dry, taking care to water close to the base of the plant, slowly, so that water makes it to the root ball instead of going right through the pot.