ICT Technician - solves technical problems from missing drives, to faulty drivers, to fixing screens, keyboards, gives technical support...broad range of things, does a bit of all the jobs listed below.
tech support - sits near a phone reading off a script, giving "Support"
Computer Repair man - more hardware based, will need to be able to put a computer together, may need to test components and install drivers.
IT Professional - normally means someone with more network knowledge needs to know the inner workings of Windows server and active directory groups and policys, aswell as software deployment.
but as people have already stated Organisations tend to not know what there talking about when it comes to IT, you may find that technical support also means helping to install drivers etc..
atm i work as a ICT technician, but im also employed to create/design and develop websites, i know the basics of windows server 2003, active directory and groups... i can take computers to bits and put them back together with my eyes closed, ive repaired laptop screens, and i give technical support to 100+ people which involves talking them through procedures, and giving general help in office and any other programs, i test software before deployment, and in general do everything you can think of, the only thing i dont really do is set up batch files for software deployment, and i dont have access to set up different policys and groups on the 2003 server, although i can manage who is in what group.