What is the meaning of the variable followed by the id parameter in the ovs command

for example:
ovs-vsctl-id=@m get mirror mymirror-- remove bridge br0 mirrors @ m and
ovs-vsctl-id=@ft create Flow_Table flow_limit=100 overflow_policy=refuse-- set Bridge br0 flow_tables=0=@ft
what are the variables in the -id=@ commands?

Thank you for answering

Sdn ovs
Jun.27,2022

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