I want to attach an identifier that can uniquely identify a specific entity.

[Xeon257]

Hello. I’d like to summon a regular Spidertron at a specific location,

and trigger a certain event only when this particular Spidertron is clicked.

Is there any way to distinguish it from other Spidertrons?

[Klonan]

You can use the entities unit number:
https://lua-api.factorio.com/latest/cla ... nit_number