no there aren't, this is the simp discussion on it https://www.theserverside.com/opinion/Master-slave-terminology-alternatives-you-can-use-right-now none of which understands that in electronics, master is applied to whatever system has command of a bus, everything else is a slave. This can then change when the master relinquishes control of the bus and a new master determined. Thus there is no primary/secondary because there can be more than two nodes on a bus. In token systems you can have dual masters running the same slaves If you try and insert dumb SJW bullshit into this it gets confusing, like when they fudged I3C into using controller/target instead, which conflicts with pre existing bus concepts like backplane system monitoring controllers and interface controllers, and also incorrectly suggests the direction of data flow is always towards a target The Left never learnt their lesson over changing words, like kids used to be cripple, then invalid, then spastics, then disabled, then handicapped, then differently abled, now they are just "brave and stunning...."